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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	Cellulose CM	9000-11-7	2g/L	1%	Water
2	Tween 20	9005-64-5	0.04g/L	2%
3	Sodium chloride	7647-14-5	2.4g/L	1%
4	Acid Red 27	915-67-3	1g/L	1%
5	Potassium dihydrogen phosphate	7778-77-0	1.2g/L	1%
6	Dipotassium hydrogenphosphate	7758-11-4	4.3g/L	1%
7	2-Methyl-4-Isothiazolin-3-one	2682-20-4	0.5g/L	1%
8	pH	/	7.3	0.1

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 6 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 Plastic bottle, with the specification of 500mL. It should be protected from breaking when carried or transported.

Storage: at 2-8 ℃ 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	Liquid State
Stroma	Water
Packing	Plastic bottle
Save conditions	Refrigeration(4±4）℃ Store airtight and away from light place.Before use, the temperature should be adjusted to at 2-8 ℃，shake uniformity.Used up after opening,prevent contamination during use.