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《Physical Testing and Chemical Analysis Part B Chemical Analysis》 2005-03
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SUSPENSION SAMPLE INTRODUCTION FAAS DETERMINATION OF COPPER AND IRON IN TOBACCO LEAVES

LIU Li-xing, LI Zhuo(Dept. of Applied Chemistry, Liaoning University of Petrochemical Engineering, Fushun 113001, China)  
The tobacco leaf sample, after being dried at 65~75 ℃ and powdered, was passed through sieve aperture of  0.095 mm, and then made into a suspension by shaking with a definite volume of agar solution. An aliquot of 4 mL was taken for the FAAS determination, after dilution to 25 mL in a volumetric flask. For the complete liberation of copper and iron from the suspended sample, 4 mL of HCl (1+1) was added to the aliquot solution before its diluting to 25 mL, standard working curve was used in the determination. It was found that the reagent blank should have the same viscosity as the sample suspension in order to give consistent data of measurements. RSD of this method was found to be less than 4.8%, and the recoveries obtained were in the range from 98.1% to 99.3%.
【CateGory Index】: TS47
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