Weiyel Reference Materials
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.
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.
| No | Analyte | CAS | Standard value | Uncertainty(k=2) | Matrix |
|---|---|---|---|---|---|
| 1 | Ammonium hydroxide | 1336-21-6 | （1+1） | 1% | Water |
| 2 | Manganese sulphate | 7785-87-7 | 10g/L | 1% | |
| 3 | Silver nitrate | 7761-88-8 | 5g/L | 1% | |
| 4 | N-Phenylanthranilic acid | 91-40-7 | 0.2% | 1% | |
| 5 | Sodium chloride | 7647-14-5 | 10g/L | 1% | |
| 6 | Ammonium persulfate | 7727-54-0 | 250g/L | 1% | |
| 7 | Cr | 7440-47-3 | 0.40mg/mL | 1% | |
| 8 | Ammonium iron(II) sulfate | 10045-89-3 | 25g/L | 2% | |
| 9 | Sulfuric acid-phosphoric acid mixed solution | / | 1% |
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.
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