Detection method of lead content in triacetin
A technology of glycerol acetate and a determination method, applied in the field of determination of lead content in triacetin, can solve problems such as physical harm to operators, low sensitivity, and complicated operation procedures, and achieves less interference in the measurement process, reduction of process losses, The effect of accurate detection results
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preparation example Construction
[0029] (3) Preparation of standard curve
[0030] Draw up 20 μL each of the standard blank solution and the prepared standard working solution of different concentrations, and automatically add 10 μl of glycerol triacetate sample diluent, and inject 5 μL of palladium nitrate solution into the graphite furnace. Under the instrument operating conditions in Table 1, measure the absorbance, and draw the standard curve according to the standard addition method.
[0031] (4) Determination of sample lead content
[0032] Place the processed sample on the sample plate, and measure under the same conditions as the standard curve preparation. A sample volume of 20 μl was injected, and the reagent blank was determined simultaneously.
[0033] (5) detection limit of the inventive method
[0034] Prepare 10 blank solutions at the same time, measure 10 blank samples with atomic absorption spectrometer, calculate the deviation, take 3 times of the deviation value as the detection limit of...
example 1
[0052] 1. Instruments and reagents: PTFE volumetric flask, 50mL. Analytical balance, the sensitivity is 0.0001g. Teflon beaker, 100mL. Graphite Furnace Atomic Absorption Spectrometer. Water, ultrapure water or double distilled water of equivalent purity. Absolute ethanol (excellent grade pure), palladium nitrate solution concentration is 2.0g / L, lead standard solution.
[0053] 2. Sample treatment: Accurately weigh 1.0g of glycerol triacetate sample A, put it into a 50ml polytetrafluoroethylene volumetric flask, then dilute to 50ml with absolute ethanol, shake well for testing.
[0054] 3. Determination method: draw standard blank solution, prepared concentration of 1.0μg / L, 5.0μg / L, 20μg / L, 40μg / L lead standard solution and 20μL each of the sample after digestion, blank, standard solution and sample 5 μ L of palladium nitrate solution was added into the graphite furnace for measurement, and the lead in the sample was measured to be 0.36 mg / kg.
example 2
[0056] As described in Example 1, a glycerol triacetate sample from manufacturer B was selected, and the lead in the sample was measured to be 0.21 mg / kg.
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