Determination of Chlorine Ion Content in High-purity Sodium Hydroxide by Silver Chloride Turibidimetry

Microamounts of chloride ion in high-purity sodium hydroxide was determined directly by the chloride turbidimetric method.The optimal analysis conditions were that the determination wavelength was 440nm and the liner range was 0～8ug/mL.The absolute difference of parallel determination was less than 0.0005%,which met national standards.The recovery of chloride ion in different levels was measured in high-purity sodium hydroxide,and the result was 96.5%～102.9%.The experimental method was accurate and simple,and it could be applied in routing inspection.