Abstract: SPECTROPHOTOMETRIC DETERMINATION OFSn(Ⅱ) CONTENT IN DTPAHSA KIT Ye Zhaoyun\ Sun Yaqing(Department of Isotope, China Institute of Atomic Energy, Bei jing 102413)Abstract The spectrophotometric determination of Sn(Ⅱ) co ntent in DTPAHSA kit is studied. The determination conditions is elected. The maximum absorption is at 460 nm. The apparent molor absorptivity is 3.2×103 　m2／mol. The recovery is 105.9%±2.2%，the relative standard deviations is less than 5%. Beer，s law is obeyed in the range of 0～2.4 mg/L for Sn(Ⅱ).Keywords SnCl2·2H2O spectrophotometry\ DTPAHSA