Hazard search
Tungsten
- CAS number
- 7440-33-7
- Also known as
- Tungsten & compounds (insoluble) (as W) · Tungsten & compounds (soluble) (as W) · Tungsten & insoluble compounds (as W) & others · Tungsten & soluble compounds (as W) · Tungsten (Elements by Cellulosic Internal Capsule Sampler) · Tungsten (Elements by ICP Aqua Regia Ashing) · Tungsten (Elements by ICP HNO3/HClO4 Ashing) · Tungsten insoluble · W
UK workplace exposure limits
| Limit | Value | Applies to |
|---|---|---|
| 8-hour TWA | 1/5 mg/m³ | |
| 15-minute STEL | 3/10 mg/m³ |
Sampling methods
| Method | Sampling | Medium | Analysis | Part numbers |
|---|---|---|---|---|
| MDHS 91/2 Metals & metalloids by XRF (non quantitative) Method document (opens in a new tab) | Active (pump) | IOM with 0.8µm MCE filter | XRF | 225-70A 225-1930 |
| NIOSH 7074 Tungsten (soluble and insoluble) by AA-F Method document (opens in a new tab) | Active (pump) | 0.8µm MCE filter in 37mm cassette | AA-F | 225-3-01 225-1 |
| NIOSH 7300 Elements by ICP (Nitric/perchloric acid ashing) Method document (opens in a new tab) | Active (pump) | 0.8µm MCE filter in 37mm cassette | ICP-AES | 225-3-01 225-1 |
| NIOSH 7301 Elements by ICP (Aqua regia ashing) Method document (opens in a new tab) | Active (pump) | 0.8µm MCE filter or 5µm PVC filter in 37mm cassette | ICP-AES | 225-3-01 225-803 225-1 |
| NIOSH 7306 Elements by Cellulosic Internal Capsule Sampler ICP -AES Method document (opens in a new tab) | Active (pump) | Solu-CAP MCE Filters Preloaded in Cassettes and Cassette Holder | ICP-AES | 225-8517 225-1 |
| OSHA ID 213 | Active (pump) | ICP | 225-3-01 225-1 225-24 | |
| OSHA ID-213 Tungsten & Cobalt by ICP -AES Method document (opens in a new tab) | Active (pump) | 0.8µm MCE filter in 37mm cassette | 225-3-01 225-1 | |
| BS ISO 15202-1:2020 Metals and Metalloids by ICP -AES Method document (opens in a new tab) | Active (pump) | IOM with 0.8µm MCE filter | 225-70A 225-1930 |
Methods and limits as published by their agencies and summarised by SKC; check the current method and the limit that applies to you before sampling.
Source: SKC Ltd (UK), Hazard Search, used with SKC's permission (opens in a new tab); SKC Inc. (USA), Sampling Guides, used with SKC's permission (opens in a new tab)