T/QAS 014-2020 Active Group standards

T/QAS 014-2020 The determination of chloride ion content in fertilizer using potentiometric titration

Publish Date: 2020-10-21 Implement Date: 2020-10-26 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/QAS 014-2020

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Fertilizers and pesticides

ICS Name: Fertilizer

Publish Date: 2020-10-21

Implement Date: 2020-10-26

Scope

Scope: 1 Scope This document specifies the principles, reagents, instruments and equipment, sampling, sample preparation, experimental steps, data processing, and precision for the determination of chloride ions in fertilizers by potentiometric titration. This document is applicable to the determination of chloride ion content in fertilizers, with a method detection limit of 0.03%; Main technical content: 4 Principles After boiling, dissolving, cooling, and decanting the fertilizer samples, the supernatant is used to determine the consumption of silver nitrate by potentiometric titration to calculate the chloride ion content. 5 Reagents All reagents used in this method are analytical grade, and the water used is Class I water as specified in GB/T 6682. 5.1 Silver nitrate titrant stock solution (0.1 mol/L): Prepared and standardized according to GB/T 601. 5.2 Silver nitrate titrant solution (0.02 mol/L): Obtained by diluting the silver nitrate titrant stock solution (0.1 mol/L) by a factor of 5. 6 Instruments and equipment 6.1 Potentiometric titrator: Silver ion detection electrode. 6.2 Centrifuge: With a rotational speed of not less than 6000 r/min. 6.3 Laboratory sample grinder. 6.4 Electronic balance: With a sensitivity of ±0.0001 g. 7 Sampling The sampling of representative samples shall be carried out in accordance with the provisions of GB/T 6679. 8 Sample preparation Take 200 g of representative samples, reduce the sample to 100 g by the four-division method, grind the sample before testing, sieve it through a 100-mesh sieve, and store it in a sample bag for later use. 9 Experimental steps 9.1 Extraction of the sample Weigh 1 g to 5 g (accurate to 0.0001 g) (see Table 1 for the range of sample weights) of the ground sample into a 250 mL beaker, add 100 mL of water, stir with a glass rod, cover with a watch glass, heat on an electric stove to a micro-boil for 5 minutes, remove and cool, then transfer to a 250 mL volumetric flas