Rapid determination of iodine content in drinking water by isopropyl sensitization and inductively coupled plasma mass spectrometry (ICP-MS)

¹ Department of Chemical Engineering, Yangzhou University, Yangzhou City, Jiangsu Province, 225009, China
² Institute of Marine Resource Development, Jiangsu Ocean University, Lianyungang City, Jiangsu Province, 222005, China )

^* Corresponding author’s e-mail: xszhu@yzu.edu.cn; yojohhit@126.com

Abstract

A subject for the rapid determination of iodine content in drinking water by isopropyl sensitization and ICP-MS was established. The samples were dissolved in 1% ammonia solution, ¹²⁷I was selected as the mass number to be measured and ¹⁵⁹Tb as an internal standard. At the same time, 4% (V/V) isopropanol was used to enhance aerosol gasification efficiency, 2% NH₃·H₂O was used to effectively eliminate memory effects of iodine by cleaning sample for 180 seconds. The results show that, the detection limits of iodine in this method are 0.007 mg·kg^-1 and it is superior to other literature. The standard curve has a good linear relationship and the recovery rates of testing rusults range are from 96.00% to 112.3%. The content of iodine in standard substance water samples was determined by ICP-MS method. The iodine content in water samples from seven drinking water sources in Lianyungang area was analyzed between 14~21 μg·L^-1. It was in line with the allowable value of 10~300 μg·L^-1 of the sanitary standard for drinking water, suggesting that the iodine content of drinking water resources in Lianyungang area was in a safe range.