This standard specifies the determination method of chromium (VI) in textile dyeing and finishing auxiliaries.
This standard is applicable to the determination of chromium (VI) in various textile dyeing and finishing auxiliaries.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
3 Theory
Dissolve the chromium (VI) in the textile dyeing and finishing auxiliaries with buffer solution, filter the extraction liquid formed via color development reaction and determine it using a liquid chromatograph equipped with a ultraviolet detector or a diode array detector, then quantify it with the external standard method.
4 Reagents and materials
Unless otherwise specified, only analytically pure reagent and Grade 3 water (defined in GB/T 6682) shall be adopted.
4.1 Phosphoric acid solution: dilute 700 mL of phosphoric acid (H3PO4, ρ=1.71 g/mL) to 1,000 mL with water.
GB/T 33093-2016 The following standards are cited：
