Welding Fume Testing Laboratory

AIHA LAP accredited welding fume testing laboratory in Houston TX. We provide ICP-AES and ICP-MS analysis for manganese, iron oxide, nickel, chromium, cadmium, and 30+ metals. Full NIOSH 7300 compliance reporting for personal breathing-zone assessments and LEV validation.

ISO/IEC 17025 Accredited AIHA LAP · ID: LAP-101470 Rush 1-Day Available 30+ Metals Simultaneous ICP
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What's onthis page Quick links to sections
Why Test?OSHA & health risk
OverviewICP-AES explained
Welding ProcessesMIG · TIG · SMAW
Health EffectsManganism · MFF
PEL ReferenceOSHA + ACGIH limits
Lab MethodsNIOSH 7300 · ICP-MS
TAT & KitsRush + free media
Field GuideMCE · pump protocols
FAQAnswers
Lab AccreditationISO/IEC 17025:2017
IH Lab AccreditationAIHA LAP · ID: LAP-101470
Environmental TestingPJLA Accredited
Lab LocationHouston TX · In-House ICP
Why Welding Fume Testing Matters

Welding fumes are highly toxic aerosols — and ACGIH manganese limits are 250× stricter than OSHA's PEL

OSHA PEL Enforcement

Individual metal PELs under 29 CFR 1910.1000 are actively enforced. Citations for manganese, hexavalent chromium, and cadmium exposures carry heavy penalties without welding fume testing documentation.

Neurological & Carcinogenic Risk

Manganese causes irreversible Parkinsonism (manganism). Nickel and hexavalent chromium are Group 1 IARC carcinogens. These are dose-dependent, cumulative diseases requiring dedicated lab monitoring.

The Manganese Gap

The ACGIH TLV for manganese (0.02 mg/m³ inhalable) is 250× more stringent than the OSHA PEL ceiling (5 mg/m³). Workers can be fully OSHA-compliant but at serious neurological risk.

Engineering Control Validation

Local exhaust ventilation (LEV), fume extraction guns, and welding enclosures reduce exposure — but only welding fume testing from an accredited lab proves they achieve levels below applicable PELs.

ICP-AES & ICP-MS Analysis

What Is Welding Fume Testing?

Welding fume testing is the process of collecting airborne metal particulates from a welder's breathing zone using a calibrated sampling pump and MCE filter, then analyzing that filter in our laboratory using Inductively Coupled Plasma — Atomic Emission Spectroscopy (ICP-AES) or ICP-Mass Spectrometry (ICP-MS).

The ICP instruments atomize and ionize the acid-digested filter matrix into a plasma at ~8,000°C, then quantify each element by its characteristic emission spectrum or mass-to-charge ratio. This enables our welding fume testing lab to provide simultaneous quantification of 30+ metals from a single filter — each reported in µg/m³ or mg/m³.

  • Personal breathing-zone monitoring — NIOSH 7300 / 7303 multi-metal ICP-AES
  • High-sensitivity ICP-MS for trace metals (beryllium, cadmium, arsenic) at sub-µg/m³
  • Simultaneous analysis of 30+ metals per filter — iron, manganese, nickel, chromium, and more
  • LEV validation sampling — before and after ventilation control installation
  • Task-based short-duration sampling during peak fume generation events
  • Combined fume + total dust gravimetric on same filter — one sample train, two datasets
Personal air sampling pump and MCE filter cassette positioned on welder's helmet for welding fume testing and OSHA compliance monitoring
Process-Specific Fume Risk

Welding Process × Fume Hazard Matrix

The metals you need to test for depend entirely on what is being welded and how. Use this reference to select the right analyte panel for your welding fume testing program before sampling begins.

Highest Fume Generation

SMAW — Shielded Metal Arc (Stick)

Produces the highest fume generation rate of any fusion welding process. Flux-coated electrode contributes fluorides, potassium, and sodium compounds on top of base metal and filler metal oxides. Confined space stick welding can generate concentrations 10–100× above open-air fume levels within minutes.

Iron oxideManganeseFluoridesPotassiumNickel (SS)Cr(VI) (SS)
High Fume · Flux Compounds

FCAW — Flux-Cored Arc Welding

Similar fume quantity to SMAW but with additional flux core contributions. Gas-shielded FCAW-G produces less fume than self-shielded FCAW-S. High manganese content in many FCAW electrodes (E71T series) makes manganese monitoring critical. Stainless FCAW generates significant Cr(VI).

ManganeseIron oxideFluoridesCr(VI) (SS)Nickel (SS)
Moderate-High Risk

GMAW — Gas Metal Arc (MIG)

Lower fume generation than SMAW per unit weld, but high deposition rates and continuous operation mean cumulative fume exposure can be as high. Globular transfer generates more fume than spray transfer. Mild steel MIG fume is primarily iron and manganese. In enclosed areas without LEV, MIG fume accumulates rapidly.

Iron oxideManganeseCopper (wire)SiliconCr(VI) (SS)
Stainless — Cr(VI) Priority

GTAW — Gas Tungsten Arc (TIG)

Lowest fume generation of fusion processes on clean base metal. However, tungsten electrode tip erosion adds tungsten compounds. TIG welding on stainless steel generates hexavalent chromium (Cr(VI)) even at low overall fume levels — the OSHA Cr(VI) PEL of 0.005 mg/m³ can be exceeded even with TIG's low total fume output.

TungstenCr(VI) (SS)Nickel (SS)Ozone
Deep Lung Penetration

Plasma Cutting & Arc Gouging

Plasma cutting generates extremely fine ultrafine particles (<100 nm) in addition to metal fumes, which penetrate deeper into the respiratory system than larger particles. Arc gouging of stainless or hard-facing alloys generates the full spectrum of metal fumes. Carbon arc gouging adds graphite smoke.

IronManganeseCr(VI) (SS)Zinc (galv.)Ultrafine particles
Coating & Base Metal

Brazing, Soldering & Hot Work

Brazing filler metals often contain cadmium (in older silver brazing alloys) and zinc. Lead fumes arise from soldering, hot work on leaded paint, or working leaded brass. Zinc oxide from galvanized steel causes metal fume fever. Hot work on any coated metal adds unknown coating decomposition products.

CadmiumLeadZinc oxideSilverCopper
Occupational Health Impacts

Health Effects of Welding Fume Exposure

Many welding fume health effects are irreversible by the time symptoms appear. Early quantitative welding fume testing is the only defense — clinical symptoms and lung function decline typically lag years behind tissue damage.

Manganism

Causative metal: Manganese (Mn)

Irreversible neurological disease from manganese accumulation in the basal ganglia. Clinically resembles Parkinson's disease — tremor, rigidity, bradykinesia, and psychiatric symptoms. Unlike Parkinson's, manganism does not respond to levodopa therapy. ACGIH TLV: 0.02 mg/m³.

Occupational Lung Cancer

IARC Group 1 — Welding Fume

IARC 2017 reclassification: welding fume is a definite human carcinogen (Group 1) for lung cancer. Risk is elevated for all welding processes — not just stainless steel. Latency typically 15–30 years, making early welding fume testing records critical for any future legal defense.

Cr(VI) Lung Cancer

Causative metal: Hexavalent Chromium

Cr(VI) from stainless and chrome-alloy welding is an OSHA-regulated carcinogen (29 CFR 1910.1026). Causes lung cancer, nasal and sinus cancer, and nasal septum perforation with chronic high exposure. OSHA PEL 0.005 mg/m³ — one of the lowest metal PELs. Requires separate sampling.

Metal Fume Fever (MFF)

Causative metal: Zinc oxide (ZnO)

Acute flu-like illness occurring 4–8 hours after inhalation of freshly generated zinc oxide fumes from galvanized steel, brass, or zinc-containing alloys. Symptoms: fever, chills, muscle aches, nausea, chest tightness. Resolves within 24–48 hours but recurs with each exposure.

Siderosis & Pulmonary Fibrosis

Causative metal: Iron oxide (FeO / Fe₂O₃)

Siderosis (iron oxide deposition in the lungs) was historically considered a benign pneumoconiosis, but recent evidence links heavy iron oxide deposition to progressive pulmonary fibrosis — especially when combined with silica or manganese.

Cadmium Nephropathy

Causative metal: Cadmium (Cd)

Cadmium from cadmium-containing brazing alloys, galvanized coatings, and cadmium-plated fasteners is an OSHA-regulated carcinogen. Causes irreversible tubular kidney damage (Fanconi syndrome) and lung cancer. PEL 0.005 mg/m³ requires immediate welding fume testing.

Regulatory Limits

Welding Fume Testing — Metal PELs & OSHA vs. ACGIH Limits

AGT Labs reports each metal against both the OSHA PEL (legal compliance) and the ACGIH TLV (health-based best practice). For manganese, nickel, and Cr(VI), the gap between the two limits is the most important number in your report.

Metal / CompoundOSHA PELACGIH TLV-TWAHealth BasisSpecific Standard
Manganese (Mn) — Inhalable Ceiling 5 mg/m³ 0.02 mg/m³ Manganism (irreversible neurological) OSHA Z-1 / ACGIH TLV 2024
Iron Oxide (FeO / Fe₂O₃) — Fume 10 mg/m³ 5 mg/m³ Siderosis, pulmonary fibrosis risk OSHA Z-1
Nickel (Ni) — Elemental, Insoluble IARC Gr. 1 1 mg/m³ 0.2 mg/m³ Lung cancer, nasal cancer, sensitization OSHA Z-1
Hexavalent Chromium Cr(VI) IARC Gr. 1 0.005 mg/m³ 0.01 mg/m³ Lung cancer, nasal septum perforation 29 CFR 1910.1026 — separate ID-215 required
Cadmium (Cd) IARC Gr. 1 0.005 mg/m³ 0.01 mg/m³ Lung cancer, kidney nephropathy 29 CFR 1910.1027
Lead (Pb) 0.05 mg/m³ 0.05 mg/m³ Neurotoxicity, renal, reproductive 29 CFR 1910.1025
Zinc Oxide (ZnO) — Fume 5 mg/m³ (fume) 2 mg/m³ Metal fume fever (acute, reversible) OSHA Z-1
Copper (Cu) — Fume 0.1 mg/m³ 0.2 mg/m³ Respiratory irritation, metal fume fever OSHA Z-1
Beryllium (Be) IARC Gr. 1 0.0002 mg/m³ 0.00005 mg/m³ Chronic beryllium disease, lung cancer 29 CFR 1910.1024

* OSHA PELs as 8-hour TWA unless noted as ceiling. Cr(VI) requires separate OSHA ID-215 sampling — not included in standard NIOSH 7300 multi-metal result. See our Hexavalent Chromium Testing page for dedicated Cr(VI) analysis.

Analytical Methods — Welding Fumes

Laboratory Methods for Welding Fume Analysis

Targeted welding fume testing uses the same ICP platform as our metals scan, but the analyte panel and collection strategy are tailored to the specific welding process and regulatory requirements.

NIOSH 7300 — Targeted Fume Panel

Configured for the specific metals relevant to the welding process: Mn, Fe, Ni, Cr (total), Cu, Zn, Pb, Cd, and other process-specific metals. Individual elements reported against OSHA PEL and ACGIH TLV. Manganese reported with explicit ACGIH TLV comparison due to the critical gap.

Standard:NIOSH 7300 / OSHA ID-121
Media:37mm MCE filter, 0.8 µm pore, closed-face
Flow rate:1.7–3.0 L/min breathing zone

OSHA ID-215 — Hexavalent Chromium

Cr VI requires a dedicated method entirely separate from ICP total metals. Air is collected on a 37mm PVC filter treated with sodium carbonate (Na₂CO₃) solution, which stabilizes Cr VI against reduction. This method is mandatory for stainless steel welding — NIOSH 7300 cannot speciate Cr VI.

Standard:OSHA ID-215 / NIOSH 7600
Media:37mm PVC filter treated with Na₂CO₃
Note:Separate filter from NIOSH 7300

Total Fume Gravimetric + ICP

Simultaneously determines total welding fume mass in mg/m³ (gravimetric, NIOSH 0500 or 0600) and individual metal concentrations in µg/m³ (ICP, NIOSH 7300) from the same MCE filter. Provides total fume load for comparison with NIOSH's 1 mg/m³ recommendation for unclassified welding fumes.

Standards:NIOSH 0500 + NIOSH 7300
Media:Pre-weighed 37mm MCE filter
Report:mg/m³ total fume + µg/m³ per metal

Stainless steel welding? Hexavalent Chromium Cr(VI) requires a separate dedicated test.

NIOSH 7300 / 7303 acid digestion destroys Cr(VI) speciation — it cannot detect hexavalent chromium. OSHA 1910.1026 requires Cr(VI)-specific sampling (OSHA ID-215 · PVC filter) for any stainless or chrome-alloy welding process. AGT Labs analyzes both in parallel.

Cr(VI) Testing Page
Field Protocol Reference

Welding Fume Sampling Field Requirements

Contamination and filter handling errors are the primary sources of invalid welding fume testing data. Metal contamination from field handling can falsely elevate metals results.

Cassette Placement & Media
Position
Clip the cassette on the welder's collar or hard hat brim within 30 cm of the nose and mouth — inside any respiratory protection hood if worn.
With respirator
If the welder wears a supplied-air or PAPR helmet, sample both outside the helmet (to measure ambient fume) and inside the breathing zone.
Cr VI media
Hexavalent chromium requires a separate, specially treated PVC filter (Na₂CO₃ coated). This filter is provided in our Cr VI kit. It cannot be used for ICP metals.
Flow rate
1.7–3.0 L/min for standard fume metals (MCE cassette). 1.0–4.0 L/min for Cr VI (PVC Na₂CO₃ cassette). Record on COC for both cassettes separately.
Representativeness & Tasks
Shift coverage
Sample must cover a representative portion of the full work shift — not just the welding period. TWA calculations require total shift time.
Multiple welders
Sample each distinct job title/task classification separately. A welder using MIG on mild steel has a different exposure profile than one TIG-welding stainless.
LEV in operation?
Document whether local exhaust ventilation (LEV), fume extraction gun, or dilution ventilation was operating during sampling.
COC Documentation — Critical Fields
Required fields
Worker name/ID, job title, exact task performed, base metal welded, consumable/electrode type, welding process (MIG/TIG/SMAW/FCAW).
Analyte selection
Specify on COC: "NIOSH 7300 full metals scan" OR list specific target metals. For stainless, explicitly request "NIOSH 7300 + OSHA ID-215 Cr VI".
Shipping
Ship in original cassette holders, upright. Na₂CO₃-coated Cr VI filters should be shipped promptly — Cr VI can reduce to Cr III over time.
Manganese — Special Considerations
Why it's critical
The OSHA PEL ceiling for Mn is 5 mg/m³. The ACGIH TLV is 0.02 mg/m³. A welder can be well below the OSHA ceiling while being exposed to 250× the ACGIH TLV.
LOD requirement
To detect exposures at or near the ACGIH TLV (0.02 mg/m³), sample volume must be large enough to collect a detectable mass of Mn above the method LOD.
Inhalable vs. respirable
The ACGIH TLV of 0.02 mg/m³ is for the inhalable fraction. This means open-face cassette at 2.0 L/min is technically appropriate for ACGIH TLV comparison.
Submission Workflow

From Welding Shift to Certified Metal Fume Report

1

Define Process

Tell us base metal, consumable, and welding process. We configure the correct welding fume testing panel and provide the right media.

2

Collect Samples

Attach MCE cassette (+ Cr VI cassette if stainless) to welder's breathing zone. Run for representative shift duration.

3

Ship — 24hr for Cr VI

Ship promptly. Cr VI filters must arrive within 10 days of collection. Use pre-paid return label in kit.

4

ICP + Cr VI Analysis

MCE: acid digestion + ICP-AES for all metals. Cr VI cassette: alkaline extraction + IC/colorimetry. Full QA review.

5

Compliance Report

All metals vs. OSHA PEL + ACGIH TLV. Manganese explicitly flagged if above ACGIH limit even if below OSHA. Secure portal delivery.

Lab Logistics

Turnaround Times & Sampling Kits

Welding Fume Testing — Turnaround Options
1-Day Rush1 business day+100%
2-Day Rush2 business days+75%
3-Day Rush3 business days+50%
4-Day Rush4 business days+25%
Standard7+ business daysNo Surcharge
Samples received before 2:00 PM CST logged same day. Combined welding fume testing + Cr(VI) orders: Cr(VI) TAT schedule applies. Call (713) 453-6090 to confirm rush availability for large batches or OSHA inspection-response orders.

Sampling Media & Equipment

  • 37mm MCE filters (0.8 µm pore) — acid-cleaned, blank-tested
  • Na₂CO₃-coated PVC cassettes for Cr VI (OSHA ID-215)
  • Acid-cleaned closed-face cassette holders
  • Calibrated personal air sampling pumps — loaner program
  • Field blanks (pre-labeled, per batch)
  • Industrial Hygiene Chain of Custody forms
  • Pre-paid UPS return shipping label
Download IH COC Form
Industries & Clients

Who Relies on AGT Labs for Welding Fume Testing

Metal Fabrication & Shipbuilding

Structural steel fabricators, pipe shops, and shipyards — routine welding fume testing (Mn, Fe, Ni, Cr VI) for OSHA compliance and ACGIH TLV documentation.

Oil & Gas / Petrochemical

Pipeline welding, vessel fabrication, turnaround maintenance — stainless steel and alloy welding generates Cr VI, nickel, and manganese. Critical for OSHA 1910.1026 Cr VI compliance.

IH Consultants & EH&S

Industrial hygiene consulting firms and environmental health & safety departments — accredited ICP results formatted for client reports, OSHA response packages, and engineering control ROI documentation.

Client Support

Welding Fume Testing — Frequently Asked Questions

What metals are found in welding fume testing?
Composition depends on the base metal, electrode, and process type. All mild steel welding generates iron oxide and manganese. Stainless steel welding adds hexavalent chromium (Cr(VI)) and nickel — both carcinogens. Galvanized steel adds zinc oxide (metal fume fever). Cadmium-plated or brazed joints add cadmium. Aerospace alloys may add beryllium or titanium. Coated metals add whatever is in the coating — lead, zinc, chromate primers. Full ICP-AES panel (NIOSH 7300) identifies all 30+ metals simultaneously.
What is the OSHA PEL for welding fumes?
OSHA does not have a single PEL for total welding fume testing output. Individual metals have their own limits. Key limits: Iron oxide fume: 10 mg/m³. Manganese: 5 mg/m³ (ceiling) — but ACGIH TLV is 0.02 mg/m³ (250× stricter). Nickel: 1 mg/m³. Cr(VI): 0.005 mg/m³ (separate standard, OSHA ID-215 method). Cadmium: 0.005 mg/m³. Lead: 0.05 mg/m³. Beryllium: 0.0002 mg/m³. AGT Labs reports against both OSHA PEL and ACGIH TLV in every welding fume report.
What is the difference between NIOSH 7300 and NIOSH 7303?
Both use ICP-AES after acid digestion, but differ in digestion technique. NIOSH 7300 uses hot block acid digestion (HNO₃/HCl at 65°C) — the standard for most metal fumes in air. NIOSH 7303 uses microwave-assisted digestion (HNO₃/HF) which achieves more complete dissolution of refractory compounds like chromium oxides in stainless steel fume and tungsten carbide. 7303 is used when 7300 recoveries are known to be low for the matrix. Neither method detects Cr(VI) — hexavalent chromium requires OSHA ID-215 on a separate PVC filter.
Why is manganese the most critical metal in welding fume testing?
Manganese causes manganism — an irreversible Parkinson-like neurological disease from basal ganglia deposition. Unlike Parkinson's, it does not respond to treatment. OSHA's ceiling of 5 mg/m³ was set in 1971. ACGIH's current TLV-TWA is 0.02 mg/m³ — 250× stricter. Welding fume from mild steel and low-alloy electrodes routinely generates Mn concentrations that exceed the ACGIH TLV even with LEV and ventilation. Monitoring only against OSHA's outdated limit creates false compliance while neurological damage accumulates.
Can you test for hexavalent chromium during welding fume testing?
Yes, but Cr(VI) requires a separate dedicated sample. The acid digestion in NIOSH 7300/7303 converts all Cr(VI) to Cr(III) — the result is total chromium, not hexavalent chromium. Cr(VI) is analyzed by OSHA ID-215 on a PVC filter — a separate filter cassette and separate pump must be deployed simultaneously on the same worker. AGT Labs provides kits with both MCE (NIOSH 7300) and PVC (OSHA ID-215) cassettes for stainless steel welding scenarios. See our dedicated Hexavalent Chromium Testing page.
What is metal fume fever (MFF) and which metals cause it?
Metal fume fever is an acute flu-like illness occurring 4–8 hours after inhalation of freshly generated metal oxide fumes — primarily zinc oxide (ZnO) from galvanized steel, brass, or zinc-coated materials. Symptoms: fever, chills, muscle aches, chest tightness, metallic taste. Resolves in 24–48 hours. Characteristic "Monday disease" pattern — symptoms are worst after weekends away from exposure. Copper, magnesium, and iron oxide can cause similar reactions. Air monitoring quantifies ZnO and copper concentrations against OSHA PELs (ZnO fume: 5 mg/m³) to confirm MFF etiology and justify controls.
What welding processes generate the most hazardous fumes?
SMAW (stick welding) generates the highest fume mass of any fusion process. FCAW is similar with added flux compounds including fluorides. GMAW (MIG) generates less fume per pass but high production rates create high cumulative exposure — especially in confined spaces. GTAW (TIG) generates low total fume but on stainless steel, Cr(VI) concentration relative to total fume is the highest of any process. Plasma cutting generates extremely fine ultrafine particles that penetrate deepest. The base metal matters as much as the process — stainless or chrome-alloy welding by any method requires Cr(VI) monitoring.
How should I sample for welding fume testing correctly?
Use 0.8 µm MCE filter in acid-cleaned 37mm closed-face cassette at 1–3 L/min (2.0 L/min standard). Position cassette on the welder's collar or lapel within 30cm of the nose — or inside the welding helmet at chin level for under-helmet assessment. Collect a full shift (8-hr TWA) or minimum 200 L. Collect field blanks (2 per batch). Do not touch filter with bare hands — metal contamination from skin falsely elevates lead, zinc, copper, and iron. For stainless welding, deploy a second pump with PVC cassette simultaneously for OSHA ID-215 Cr(VI) analysis.
Do you supply sampling pumps for welding fume testing?
Yes. With 5 business days notice, AGT Labs provides complete welding fume sampling kits: acid-cleaned MCE cassettes (and PVC for Cr(VI) if needed), calibrated personal sampling pumps, field blanks, COC forms, and pre-paid return shipping. We also offer a pump loaner program for qualifying clients — contact us at (713) 453-6090.

Ready to Submit Welding Fume Samples or Request a Kit?

ISO/IEC 17025 accredited · AIHA LAP · NIOSH 7300 & OSHA ID-215 · Rush TAT · Houston TX

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