T/GZNFS 001.2-2019 Active Group standards

T/GZNFS 001.2-2019 Chemical Analysis Methods for Tungsten Slag - Part 2: Determination of Molybdenum Content

T/GZNFS 001.2-2019

Publish Date: 2019-12-02 Implement Date: 2019-12-02 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/GZNFS 001.2-2019

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Non-ferrous metals and their alloy products

ICS Name: Other non-ferrous metals and their alloys

Publish Date: 2019-12-02

Implement Date: 2019-12-02

Scope

Scope: This part specifies the method for determining the molybdenum content in alkali slag produced during the alkali decomposition process of ammonium paratungstate. This part is applicable to the determination of molybdenum content in alkali slag produced during the alkali decomposition process of ammonium paratungstate. The determination range (mass fraction): 0.10% to 2.00%; Main technical content: The sample is melted with sodium peroxide, extracted with water, and the molybdenum is separated from most of the iron, manganese, copper, bismuth, and calcium. The tungsten is masked with citric acid, and with copper salt as a catalyst, the molybdenum is reduced to the pentavalent state in a dilute sulfuric acid solution. Then, the molybdenum reacts with thiocyanate to form an orange-red complex, and its absorbance is measured at a wavelength of 460 nm using a spectrophotometer to calculate the molybdenum content.