T/QAS 015-2020 Active Group standards

T/QAS 015-2020 Determination of Calcium and Magnesium Content incompound fertilizer by Inductively Coupled Plasma Spectroscopy

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 015-2020

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: This document specifies the principle, reagents, instruments and equipment, sampling, sample preparation, experimental procedures, data processing, and precision for the determination of calcium and magnesium content in compound fertilizers by inductively coupled plasma emission spectrometry. This document is applicable to the determination of calcium and magnesium content in compound fertilizers; Main technical content: 4. Principle: The compound fertilizer samples are digested with nitric acid and perchloric acid, cooled, and volumetrically measured. After drying and filtering, the calcium and magnesium ions in the samples are determined by inductively coupled plasma emission spectrometry, and the calcium and magnesium content in the compound fertilizers is calculated. 5. Reagents: All reagents used in this method are analytical grade, and the water used is Class I water specified in GB/T 6682. 5.1 Nitric acid (ultra-pure). 5.2 Perchloric acid (ultra-pure). 5.3 Standard solutions: The standard stock solutions of calcium and magnesium are both 1000 mg/L, and the standard solutions can be prepared according to GB/T 602 or purchased from certified standard solution suppliers. 6. Instruments and equipment 6.1 Spectrometer: Inductively coupled plasma emission spectrometer. 6.2 Electronic balance: With a sensitivity of ±0.0001 g. 6.3 Laboratory sample crusher. 7. Instrument working conditions 7.1 Instrument working parameters can refer to the informative Appendix A. 7.2 Analysis wavelength 7.2.1 Calcium analysis wavelength: 315.887 nm; 7.2.2 Magnesium analysis wavelength: 280.270 nm. 8. Sampling The sampling of representative samples shall be carried out in accordance with the provisions of GB/T 6679. 9. Sample preparation Take 200 g of representative samples, reduce the sample to 100 g by the four-division method, crush the samples with a sample crusher before testing, sieve through a 100-mesh sieve (0.149 mm), and store in a sample bag for later use. 10