Determination method: flame atomic absorption method
Reagents and main instruments
1. WFX-1F2B2 atomic absorption spectrophotometer; Shanghai Chuangsai Technology provides visible spectrophotometer E52-722PC, commodity number: E52-722PC, inquiry.
2. Standard stock solution of Ca, Mg, Fe, Zn, Cu, Ni, Co: 1mg/ml (Beijing National Standards Research Center);
3, cerium dichloride: 5% analytically pure;
4. Nitric acid, hydrochloric acid and perchloric acid: analytically pure.
Sample source and sample preparation
Accurately weigh 0.5g of tea leaves in the flask, add 20ml of HNO3, dilute and digest for 12min, add 5ml of perchloric acid the next day, heat to a colorless transparent near-dry on low heat, transfer to 25ml volumetric flask after cooling, use 3% Make up the volume of HNO3 and shake it for use. Shanghai Chuangsai Technology provides perchloric acid, AR, 7601-90-3, product number: C16-P11006-500ml, the price is 85 yuan.
Standard working curve drawing
Configure the standard working fluid for each element. The absorbance of the solution was determined according to the instrument operating parameter table, the working curve was drawn, and the regression equation and correlation coefficient were calculated.
Sample determination
According to the working conditions of the instruments listed in the instrument operating parameter table, determine the mass fraction of Ca, Mg, Fe, Zn, Cu, Ni and Co in the sample solution, measure 5 times, multiply the measured value by the dilution factor. The mass fraction of the above seven ions.
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