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原子吸收光譜(編輯修改稿)

2025-08-21 02:27 本頁面

　

【文章內容簡介】 9) Select “E”, inject blank solution into the flame and adjust the meter to zero.(10) Optimize analysis conditions and measure standard solution and samples.(11) After pletion of measurement, turn off acetylene gas valve and then air pressor, cut off gas supply a moment later.(12) Select “T” before turning off high voltage power, decrease lamp current and then turn off the lamp. At the same time, all buttons should be on original positions.(13) Check the equipment before leaving the laboratory.2. Determination of soil samples(1) Preparation of extracting solution ( mol/l EDTA solution) g of EDTA is dissolved with water in a beaker (500 ml). The PH is adjusted to using dilute ammonia. The mixture is transferred into a volumetric flask (1000ml), dilute to the mark and mixed well.(2) Treatment of soil samples g of airdried soil (60100 mesh) is put into an Erlenmeyer flask with stopper (100 ml). ml of EDTA solution is added. The mixture is shaken for 1h and then filtered. The filtrate is preserved for analysis.(3) Preparation of Cu standard stock solution g of Cu is dissolved in 15 ml of (1:1) nitric acid solution The mixture is transferred into a volumetric flask (1000 ml) and diluted to the mark with redistilled water. The concentration of the stock standard solution is 100 g/ml. (The concentration should be calculated according to the mass of Cu).The working Cu standard solution (10 g/ml) is obtained by diluti

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