Method for detecting contents of lead, chromium, cadmium and copper in food
A detection method and technology of copper content, applied in the detection of cadmium and copper content, lead and chromium in milk and dairy products, can solve the problems of high labor intensity, different pretreatment steps, long detection working time, etc., and achieve The effects of far-reaching environmental protection, optimization of the pre-treatment process, and high work efficiency
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Embodiment 1
[0015] Example 1 : preprocessing method.
[0016] 1. Reagents and solutions:
[0017] Nitric acid solution with a volume fraction of 63%: commercially available concentrated nitric acid solution, superior grade;
[0018] 0.5mol / L nitric acid solution: Accurately absorb 32mL concentrated nitric acid (superior pure), add it into a beaker filled with 100mL ultrapure water, mix well, transfer to a 1000mL volumetric flask after cooling, and use an ultrapure level to determine the volume to 1000mL and mix well.
[0019] 2. Pretreatment of samples to be tested (parallel operation when multiple samples are involved):
[0020] 1) Weigh a certain amount (about 5.0g) of milk samples to be tested, 5.3690g (sample 1), 4.7693g (sample 2) and 1.2051g (sample 3) and 1.1563g (sample 4) of milk powder samples, and place them in the electric heating Heat the plate at 60-80°C until it is completely carbonized to obtain a carbonized sample;
[0021] 2) Transfer the carbonized sample into t...
Embodiment 2
[0025] Example 2 :Detection method.
[0026] 1. Reagents and solutions:
[0027] Standard solution of lead, chromium, cadmium, and copper elements: absorb lead, chromium, cadmium, and copper element standard stock solutions with a mass concentration of 1000 μg / mL of lead, chromium, cadmium, and copper elements as shown in the following table, and configure 10ug respectively / ml, 1ug / ml concentration of the standard intermediate solution in a 100mL volumetric flask, with a mass fraction of 0.5mol / l nitric acid solution to volume, and mix. Prepare standard solutions of lead, chromium, cadmium, and copper elements with different mass concentrations as shown in Table 1.
[0028] Table 1. Mass concentrations of standard solutions of lead, chromium, cadmium, and copper elements
[0029] Numbering Lead standard solution (ng / ml) Chromium standard solution (ng / ml) Cadmium standard solution (ng / ml) Copper standard solution (ug / ml) 1 5 1 1 0.05 2 10 ...
Embodiment 3
[0040] Example 3 : precision test.
[0041] Obtain lead, chromium, cadmium, copper element content according to the inspection method of embodiment 2, calculation precision is as shown in table 4:
[0042] Table 4. Precision Tests
[0043] Lead element content (mg / kg) Chromium content (mg / kg) Cadmium element content (mg / kg) Copper content (mg / kg) 1 0.0132 0.0149 0.0100 0.375 2 0.0130 0.0151 0.0098 0.330 3 0.0129 0.0149 0.0096 0.345 4 0.0133 0.0158 0.0092 0.358 5 0.0128 0.0143 0.0091 0.353 6 0.0133 0.0141 0.0090 0.399 7 0.129 0.0158 0.0091 0.351 Standard DeviationRSD% 1.62 4.40 4.21 6.23
[0044] It can be seen from Table 4 that the detection RSDs of the four elements are all less than 10%, and the precision test meets the methodological requirements.
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