Identification of leaching toxicity by inductively coupled plasma emission spectrometry (4)

(8) Results presentation

(1) The mass concentration of the metal element to be tested in the solid waste leachate is expressed in mg/L

(2) The content of metal elements to be measured in solid and dryable semi-solid solid waste, liquid non-dryable and non-dryable semi-solid solid waste is expressed in mg/kg

(3) The measured value of the element after deducting the blank value is the mass concentration of the element in the sample

(4) If the sample is enriched or diluted before the measurement, the measurement result should be divided or multiplied by a corresponding multiple

(5) The measurement result retains up to three significant digits

(6) The content of the metal element to be measured in the solid waste/(mg/kg) is calculated according to formula (1):

In the formula, p—the concentration of the test substance in the extract, mg/L;

V—Volume of extraction liquid, L;

m—the mass of the sample to be extracted; kg

(9) Quality assurance and quality control

(1) When measuring samples in batches, every 10 samples are a group, and a quality control sample of the element to be measured is added to check the drift of the instrument

(2) Blank experiment: Make at least 2 laboratory blanks for each batch of samples, and the blank value of the measured element shall not exceed the lower limit of the method

(3) A calibration curve must be drawn for the analysis of each batch of samples, and the correlation coefficient of the calibration curve should not be less than 0.

(4) Parallel double sample determination: 10 samples are made into one parallel double sample.

(5) When the actual sample is measured for the leaching solution, the accuracy of standard addition is used to control the accuracy, and the recovery rate of the addition should be between 80% and 120%

(+)Notes

(1) The instrument should be warmed up for 1 hour to prevent wavelength drift

(2) After all the containers used in the measurement need to be cleaned, they should be rinsed with 10% hot nitric acid , then rinsed with tap water and deionized water repeatedly to minimize the blank background value

(3) If the content of certain elements in the measured sample is too high, the analysis should be stopped immediately, and the injection system should be flushed with 2% nitric acid + 0.

(4) For elements whose spectral line wavelength is less than 190mm, high sensitivity can be obtained by using vacuum ultraviolet channel to measure

(5) Elements with too low content can be determined after concentration
.

(6) Beryllium and arsenic are highly toxic and carcinogenic elements.
When preparing standard solutions and testing, prevent direct contact with the skin and maintain a good indoor exhaust system
.