HG/T 2784-2012 Ammonium Sulfite for Industrial Use
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- Issue Time
- Feb 11,2026
Summary
Each batch of ammonium sulfite in solid or liquid form leaving the factory shall undergo inspection by the quality supervision and inspection department of the manufacturing enterprise to ensure all product specifications comply with this standard.
5.2 Each batch of ammonium sulfite in solid or liquid form leaving the factory shall undergo inspection by the quality supervision and inspection department of the manufacturing enterprise to ensure all product specifications comply with this standard. Every batch of products released must be accompanied by a quality certificate or product qualification certificate, which shall include: the manufacturer's name and address, product name, production date or batch number, product grade, net content, and the standard number.
5.3 Sampling Procedures for Bagged Solid Ammonium Sulfite The sampling unit count shall be determined in accordance with GB/T 6678. From the selected bags, insert the sampler to a depth of two-thirds to collect samples, which shall then be reduced to approximately 1000g using the quartile method. For liquid ammonium sulfite stored in railway tank cars, storage tanks, or truck tankers, sampling shall be performed as specified in GB/T 6680, with a minimum sample volume of 500ml. Samples shall be transferred to two clean, dry, stoppered brown wide-mouth bottles and sealed. Each bottle shall be labeled with the manufacturer's name, product name, category, grade, batch number, sampling date, and sampler's name. One bottle shall be retained for testing, while the other shall be stored for one month for reference.
5.4 The conformity to this standard shall be determined by comparing the test results with the rounding-off value specified in GB/T 8170. If any test result fails to meet the requirements of this standard, a retest shall be conducted by sampling from twice the quantity of packaging or from the sampling point. If the retest results show that one indicator fails to meet the requirements of this standard, the entire batch of products shall be deemed non-conforming.