碘化物对饮水卫生有着重要意义,所以在水化学的研究中对碘的测定相当重视。硫氰酸汞法测定碘化物,需使用有害的汞试剂。硫酸高铈催化比色法,灵敏度高,但该方法操作条件严格、复杂。内海等人使用0.5M KI溶液,代替硫氨酸汞,利用I_3的生成,在350nm下测定水相的吸光度。该法比硫氰酸汞法灵敏,大量氯离子共存时没有干扰。但使用0.5M KI溶液,I~-非常易氧 Iodide is of great importance to drinking water hygiene, so considerable attention has been paid to the determination of iodine in water chemistry research. Mercury thiocyanate method for the determination of iodide, the use of harmful mercury reagents. Cerium sulfate catalytic colorimetric method, high sensitivity, but the method of operating conditions rigorous and complex. Inland Sea and others using 0.5M KI solution, instead of mercuric chloride, the use of I_3 generation, measured at 350nm absorbance of the aqueous phase. This method is more sensitive than mercury thiocyanate, a large number of chloride ions coexist without interference. But using 0.5M KI solution, I ~ - very easy to oxygen