Hazard search
Hydrogen cyanide
- CAS number
- 74-90-8
- Also known as
- HCN · Hydrocyanic acid · Hydrocyanic acid (hydrogen cyanide) · Hydrogen cyanide (cyanides) · Hydrogen cyanide (hydrocyanic acid)
UK workplace exposure limits
| Limit | Value | Applies to |
|---|---|---|
| 8-hour TWA | 0.9 ppm | |
| 8-hour TWA | 1 mg/m³ | |
| 15-minute STEL | 4.5 ppm | |
| 15-minute STEL | 5 mg/m³ |
Notations
- Sk: can be absorbed through the skin
Sampling methods
| Method | Sampling | Medium | Analysis | Part numbers |
|---|---|---|---|---|
| MDHS 56/3 Hydrogen Cyanide by ISE Method document (opens in a new tab) | Active (pump) | Midget impinger with prefilter | ISE | 225-36-2 225-22 225-70A 225-1911 225-1930 |
| MDHS 56/3 Hydrogen cyanide by ISE Method document (opens in a new tab) | Active (pump) | Midget impinger with prefilter | 225-36-52 225-22 225-70A 225-19 | |
| NIOSH 6010 Hydrogen cyanide by VAS Method document (opens in a new tab) | Active (pump) | Soda lime tube (600/200mg) & glass fibre filter in cassette | VAS | 226-210 225-710 |
| NIOSH 6017 Hydrogen cyanide by IC Method document (opens in a new tab) | Active (pump) | Soda lime tube (600/200mg) & glass fibre filter in cassette | IC/ELCM | 226-210 225-710 |
| NIOSH 7904 Cyanides by ISE Method document (opens in a new tab) | Active (pump) | 0.8µm PVC filter with fritted midget impinger | ISE | 225-2705 225-2LF 225-36-2 225-22 225-1 225-17-32 |
| OSHA 1015 Hydrogen Cyanide by IC -ELCHIM Method document (opens in a new tab) | Passive | Soda lime passive sampler | IC-ELCM | 590-400 |
| OSHA ID 120 | Active (pump) | ISE | 225-3LF 225-36-2 225-22 225-5 225-2902 | |
| OSHA ID-120 Cyanide by ISE Method document (opens in a new tab) | Active (pump) | 37mm MCE filter with midget impinger | 225-5 225-2902 225-3LF 225-36-2 225-22 | |
| Non-agency Hydrogen cyanide by Colorimetric analysis | Direct-reading | Gastec detector tube | 810-12H 810-12M 810-12L 810-12LL | |
| Non-agency Hydrogen cyanide by Colorimetric analysis | Passive | Gastec Dosi-tube | 810-12D | |
| Non-agency VOCs by solvent desorption and GC-FID Method document (opens in a new tab) | Passive | Passive sampler | 575-001 575-002 | |
| Other | Passive | IC-ELCHIM | 590-400 | |
| Other | Passive | DR | 810-12D |
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)