---
title: "Nitric acid (7697-37-2): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/nitric-acid-7697-37-2/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/nitric-acid-7697-37-2/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/nitric-acid-7697-37-2/
---

Hazard search

# Nitric acid

CAS number

7697-37-2

Also known as

Aqua fortis · Nitric acid (see online Passive Sampling Guide)

## UK workplace exposure limits

| Limit | Value | Applies to |
| --- | --- | --- |
| 15-minute STEL | 1 ppm |  |
| 15-minute STEL | 2.6 mg/m³ |  |

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **NIOSH 7903** | Active (pump) |  | IC | [226-10-03](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-10-03) |
| **NIOSH 7907** / Volatile Acids by IC / [Method document (opens in a new tab)](http://www.cdc.gov/niosh/docs/2003-154/pdfs/7907.pdf) | Active (pump) | Coated quartz filter and quartz prefilter | IC-CD | [225-9032](https://analyt-mtc.com/catalog/product/skc-coated-treated-filters/#part-225-9032) / [225-1](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-1) |
| **OSHA 165SG** / Acid mists by IC / [Method document (opens in a new tab)](https://www.osha.gov/sites/default/files/methods/osha-id165sg.pdf) | Active (pump) | Silica gel tube (400/200mg) |  | [226-10-03](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-10-03) |
| **OSHA ID 165SG** | Active (pump) |  | IC | [226-10-03](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-10-03) |
| **Non-agency** / Nitric acid by Colorimetric analysis | Direct-reading | Gastec detector tube |  | [810-15L](https://analyt-mtc.com/catalog/product/gastec-colour-gas-detector-tubes/#part-gst-15l) / [810-80](https://analyt-mtc.com/catalog/product/gastec-colour-gas-detector-tubes/#part-gst-80) |
| **Non-agency** / Nitric acid by Colorimetric analysis | Passive | Gastec Dosi-tube |  | [810-14D](https://analyt-mtc.com/catalog/product/gastec-passive-dosi-tubes/#part-gst-14d) / [810-17D](https://analyt-mtc.com/catalog/product/gastec-passive-dosi-tubes/#part-gst-17d) |
| **Other** | Passive |  | DR | [810-17D](https://analyt-mtc.com/catalog/product/gastec-passive-dosi-tubes/#part-gst-17d) / [810-14D](https://analyt-mtc.com/catalog/product/gastec-passive-dosi-tubes/#part-gst-14d) |

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)](https://www.skcltd.com/hazard-search.html); [SKC Inc. (USA), Sampling Guides, used with SKC's permission (opens in a new tab)](https://international.skcinc.com/sampling-guides/)