Reference material for cadmium analysis in fertilizers

Reference material for cadmium analysis in fertilizersThis standard substance is applicable tofertilizermiddlecadmiumelementResearch on ContentMonitoring and surveillance are of great significance and can be used in agricultureandPrecision evaluation of methods in analysis and testing related to environmental protection and other fieldspersonnel evaluationAnd quality control during the process.

Onesample preparation

Selection of this standard substancestableofcompound fertilizerFor the substrateBy adding minerals to form granules and adopting forced drying、grindingWaiting for special homogenization methods, andsutraCo₆₀Radiation sterilization, after low-temperature drying, the samples are packaged in a clean roomplasticStore in the bottle away from light.

IICharacteristic values and uncertainties

The uncertainty assessment of the characteristic values of this standard substance mainly considersThe uncertainty components introduced by the joint calibration of multiple laboratories, as well as the uncertainty components introduced by the uniformity and stability tests of standard materials.

IIIUniformity testing and stability assessment

Refer to national standard materialsrelatedTechnical specifications require randomly selecting standard substance samples after packaging,According to national standardsGB/T23349-2020Determination of arsenic, cadmium, chromium, lead, and mercury content in fertilizersNY/T1978-2022Determination of Mercury, Arsenic, Cadmium, Lead, and Chromium Content in Fertilizers,adopt酸消解-Graphite Furnace Atomic Absorption Spectroscopylaw(GAAS)Conduct uniformity and stability tests, with a minimum sampling size of0.2gThe results indicate that the series of standard materials have good uniformity and stability. The validity period of this standard substance is from the date of self determination3Year. The research and development unit will continue to track and test the stability of the standard substance. If any changes in the value are found within the validity period, the user will be notified in a timely manner.

4Traceability and value determination methods

This standard substance is assigned values using a joint calibration method by multiple laboratories. The fixed value method is酸消解-Graphite Furnace Atomic Absorption Spectroscopylaw(GAAS)By using measurement methods and instruments that meet the requirements of metrological characteristics, the traceability of characteristic values of standard substances is ensured.

five. Packaging, Storage, and Use

Reference material for cadmium analysis in fertilizersThis standard substance is based onplasticBottle packaging, each bottle40gStore in a dark, clean, and room temperature place; During the process of opening and using

Strictly prevent contamination;After weighing, it should be sealed in a timely manner to prevent the product from becoming damp and affecting its characteristicsThe minimum sampling size is specified as0.2gWhen using, please do not lower the sampling amount;Try not to use glassware during the digestion process to prevent the introduction of contaminating elements.