CRM Hongmeng standard substance/Ethylenediaminetetraacetic acid disodium (EDTA) volumetric analysis standard substance (ethylenediaminetetraacetic acid disodium) c (EDTA): 0.1mol/L500mL

This solution standard substance is widely applicable in the fields of hygiene, environmental protection, medicine, agriculture, chemical engineering, teaching, etc(titration)Confirm and evaluate relevant analysis methods, laboratory quality control, and also suitable for measuring system value transmission, certification and assessment of on-site specialized standard substances.

1、 Sample preparation

This standard substance is classified as a national second level standard substanceGBW(E)060025Ethylenediaminetetraacetic acid disodium purity standard substance as solute, using deionized water as solvent, at room temperature20℃±2Using weight in a clean laboratory at ℃-It is accurately prepared using the capacity method.

2、 Traceability and value determination methods

This standard substance uses the prepared value as the standard value for complexation concentration, and its quantity value is verified by weighing titration method. The quantity value of the standard substance in this solution is determined by the selected methodGBW(E)060025Ethylenediaminetetraacetic acid disodium purity standard substance ensures the traceability of the quality value of the standard substance by using preparation, measurement methods, and measuring instruments that meet the requirements of metrological characteristics.

3、 Characteristic values and uncertainties

The uncertainty of standard values is mainly composed of uncertainty components introduced by raw material purity, solution preparation, uniformity, stability, etc.

4、 Uniformity inspection and stability assessment

according toJJF 1343 - 2012The general principles and statistical principles for determining the value of standard substances refer to the use of zinc chloride titration to perform uniformity and stability tests on randomly sampled and packaged samples. The test results indicate good uniformity and stability.

The validity period of this standard substance is from the date of self determination24A month. The research and development unit will continue to track and monitor the stability of the standard substance. If any changes in the value are found during the validity period, the user will be notified in a timely manner.

5、 Packaging, Storage, and Use

1. Packaging: This standard substance is packaged in brown control bottles, with specifications of100mL/The bottle should be accurately removed as needed during use.

2. Transportation: Maintain transportation temperature at0Above ℃,0Transport in insulated boxes below ℃.

3. Storage and use: Store at room temperature and in the dark. Due to the slight changes in solution concentration caused by changes in room temperature, it should be kept at a constant temperature before use(20±2)℃ and shake evenly. If the room temperature exceeds this range, it can be checkedGB 601-2016AppendixAPerform solution volume correction. This standard substance should be used once after opening, and contamination should be strictly prevented during use.