Reaffirmed 2024

1. SCOPE

This standard specifies the following three methods determining chromium (VI) in water soluble dyes under defined conditions.

1.1 Method 1 — Activated Carbon Solid Phase Extraction Followed by Derivatization and Colour Measurement by Spectrophotometer

The method described is suitable to quantify the chromium (VI) content in water soluble dyes down to 3.0 mg/kg. This method is applicable to all types of water soluble dyes. Cr (VI) content in water soluble dyes like, reactive yellow HE 6G, reactivered 218, turquoise blue HGN, reactive navy blue RX, reactive black 5A etc. have been validated by this method.

1.2 Method 2 — HPLC Post Column Derivatization Followed by Spectrophotometer Analysis

The method described is suitable to quantify the chromium (VI) content in water soluble dyes down to 3.0 mg/kg. This method is applicable to all types of water soluble dyes. Cr (VI) content in watersoluble dyes like, reactive yellow HE 6G, reactive red 218, turquoise blue HGN, reactive navy blue RX, reactive black 5A etc. have been validated by this method.

1.3 Method 3 — Pre Column Derivatization Followed by HPLC Analysis

The method described is suitable to quantify the chromium (VI) content in water soluble dyes down to 1.0 mg/kg. This method is applicable to all types of water soluble dyes. Cr (VI) content in water solubledyes like, reactive yellow HE 6G, reactive red 218, turquoise blue HGN, reactive navy blue RX, reactive black 5A etc. have been validated by this method

2. References

The following standards contain provisions, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:

IS No. Title

1070 : 1992 Reagent grade water

14816 : 2000 Leather — Method of tests for ECO criteria