---
title: "Dichlorobenzidine (91-94-1): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/dichlorobenzidine-91-94-1/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/dichlorobenzidine-91-94-1/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/dichlorobenzidine-91-94-1/
---

Hazard search

# Dichlorobenzidine

CAS number

91-94-1

Also known as

3,3'-Dichlorobenzidine · DCB

## UK workplace exposure limits

Our data hold no UK limit for this substance.

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **NIOSH 5509** | Active (pump) |  | HPLC-UV | [225-16](https://analyt-mtc.com/catalog/product/glass-fibre-depth-filters/#part-225-16) / [225-32](https://analyt-mtc.com/catalog/product/cassette-and-filter-holders/#part-225-32) |
| **OSHA 65** / GC-ECD / [Method document (opens in a new tab)](https://www.osha.gov/sites/default/files/methods/osha-65.pdf) | Active (pump) | Filter Cassette | GC-ECD | [225-9004](https://analyt-mtc.com/catalog/product/skc-coated-treated-filters/#part-225-9004) / [225-1](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-1) |

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/)