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Determination of Micro Amounts of Iodine in Soil by Amplified Reaction Colorimetric Method

WANG Jian fei ,DUAN Li zhen and LIU Nai hui (Anhui Agrotechnical Teachers College, Fengyang 233100),Fenxi Shiyanshi,1999,18(6):71~74  
Under acidic conditions,I - in the sample solution is oxidized to IO 3 - with saturated bromine solution.Then the reaction of IO 3 - and excessive I - in chromogenic agent produces I 2,the product of I 2 starch reaction makes the solution blue,and the content of I - is determined by colorimetric method. The is method has higher sensitivity,and the detection limit is 0 0169mg/L,and the linear range of determination of I - is 0 04~0 8 mg/L.The method has been used for the analysis of soil samples with,RSD≤5 3%( n =4),and recovery of 90%~112%.
【CateGory Index】: S153.1
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