HG/T2785-2012 Ammonium Bisulfite for Industrial Use

The qualified ammonium bisulfite products shall comply with the requirements specified in Table 1.

Table 1

project metric

surface Pale yellow liquid

Total sum of ammonium bisulfite and ammonium sulfite,% ≥ 54.0

Ammonium thiosulfate,% ≤ Ammonium thiosulfate,% ≤ 0.08

The ratio of ammonium bisulfite to ammonium sulfite is ≥ The ratio of ammonium bisulfite to ammonium sulfite is ≥ 2.5

4 sampling

4.1 Liquid ammonium bisulfite shall be shipped in railway tankers, truck tankers, storage tanks, or plastic bags, with each vehicle, tank, or bag constituting a single batch.

4.2 Sampling shall be conducted in accordance with Chapter 2 of GB/T 6680. The sampling volume shall not be less than 500 mL. The sample shall be divided into two clean, dry, stoppered wide-mouth bottles and sealed. Labels shall be affixed to the bottles, indicating the manufacturer's name, product name, category, grade, batch number, sampling date, and sampler's name. One bottle shall be used for testing, and the other shall be retained for reference.

5 Test Methods

The reagents and water used in this standard, unless otherwise specified, shall be analytical grade reagents and water in accordance with the third-grade water specified in GB/T 6682.

Standard solutions, preparations, and products required for the experiment shall be prepared in accordance with the provisions of GB/T 601 and GB/T 603, unless otherwise specified.

The results were compared with the rounding value of GB / T 1250 to determine whether the test results were in accordance with the standard.