Ammonium Metatungstate National Standard(Ⅰ)

1.Range Ammonium metatungstate national standard stipulates the requirement, test method, detection rule, sign, packing, transportation, storage, quality certificate and contract (or order) content. 
This standard is applied for ammonium metatungstate used in petroleum chemical industry and deep processing of tungsten industry.

2.Requirement 
2.1 Product classification 
According to different producing method, ammonium metatungstate can be sorted into two grade: AMT-P and AMT-J, AMT-P is produced by spray method, AMT-J is produced by crystallization method. 
2.2 Chemical component: 

2.3 Water insoluble matter 
Under room temperature, water soluble matter tested by WO3 content 650g/L solution is less than 0.05%. 
2.4 PH value 
Under room temperature, PH value tested by WO3 content 650g/L solution is less than 4.5. 
2.5 Appearance quality 
The product is white powder of light yellow crystal, under visual contact there is no inclusion or agglomeration.

3.Test method 
3.1 Chemical component test is processed under provision GB/T 4324. 
3.2 Water insoluble matter test is processed under provision GB/T 23368.1. 
3.3 PH value is tested by PH meter. 
3.4 Appearance quality is tested by visual contact.


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