SL/T 788-2019 in English

Instrument configuration requirements

• The continuous flow analysis system needs to be equipped with an automatic sampler, a chemical reaction module and a detection unit
• The detection unit should be equipped with a 10-50mm colorimetric cell
• Each parameter corresponds to a specific filter (such as total nitrogen 540-550nm)

Quality control measures

1. Each batch of samples needs to have a field blank and a laboratory blank
2. The standard curve correlation coefficient is ≥0.999
3. Curve calibration verification is required for every 10 samples
4. The spike recovery rate should be controlled at 90%-110%

This standard has significant advantages over traditional methods:

• Automated continuous detection of multiple parameters is achieved, and the analysis time of a single sample is shortened by 60%
• Online digestion technology is used to improve the efficiency of total nitrogen detection
• The interference of volatile phenol determination is effectively eliminated through the gas-liquid separation module
• Background subtraction reagent is introduced to improve the accuracy of hexavalent chromium detection