Quality control samples for analysis of available components in alkaline soil | Soil

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Quality control samples for analysis of available components in alkaline soil View Certificate

This product can be used as a working standard for daily analysis and testing; It can also be used for laboratory quality control such as test method evaluation and instrument calibration.

1、Traceability and value determination method

The standard value is verified by . The traceability of the product quantity value is ensured through the use of production, measurement methods and measuring instruments that meet the requirements of metrological characteristics.

2、Characteristic value and expanded uncertainty

No	Analyte	CAS	Standard value	Uncertainty(k=2)	Matrix
1	pH	/	7.45	0.07	soil
2	Calcium carbonate	/	12g/kg	2g/kg
3	Free iron	/	42.7g/kg	3.7g/kg
4	Total nitrogen	/	1.20g/kg	0.06g/kg
5	Organic matter	/	18.3g/kg	/
6	Available phosphorus	/	20.4mg/kg	3.3mg/kg
7	Available k	/	84mg/kg	/
8	Effective Iron-DPTA	/	40mg/kg	3mg/kg
9	Effective Manganese-DPTA	/	29mg/kg	3mg/kg
10	Effective Copper-DPTA	/	2.3mg/kg	0.3mg/kg
11	Effective Zinc-DPTA	/	1.04mg/kg	0.09mg/kg
12	Exchangeable potassium	/	0.16cmol（K⁺）/kg	0.03cmol（K⁺）/kg
13	Exchangeable sodium	/	0.28cmol（Na⁺）/kg	/
14	Exchangeable calcium	/	9.0cmol（1/2Ca⁺⁺）/kg	1.0cmol（1/2Ca⁺⁺）/kg
15	Exchangeable magnesium	/	1.2cmol（1/2Mg⁺⁺）/kg	0.2cmol（1/2Mg⁺⁺）/kg
16	Cation exchange capacity EDTA ammonium acetate	/	15.6cmol（+）/kg	1.6cmol（+）/kg

3、Uniformity test and stability investigation

According to ISO 33405 metrology technical specification, the samples are randomly sampled after packaging, and the uniformity test and long-term stability tracking of the product are carried out by . The results show that the uniformity meets the F test rules and has good stability.

The quantitative value of this product is valid for 24 months from the date of value determination. The research and development unit will continue to track and monitor the stability of the product. If the value changes during the validity period, the user will be notified in time.

4、Packaging storage and use

Packaging: This product is packaged in polyethylene bottle, with the specification of 200g. It should be protected from breaking when carried or transported.

Storage: Room temperature and in the sealed and light-proof conditions. Before use, it should be （20±3）℃℃ fully shaken to ensure homogeneity. This product should be used as soon as possible after being opened. During the use process, strict precautions should be taken to prevent contamination.

Form	Solid State
Stroma	soil
Packing	polyethylene bottle
Save conditions	Refrigeration(4±4）℃ Store airtight and away from light place.Before use, the temperature should be adjusted to Room temperature，shake uniformity.Used up after opening,prevent contamination during use.