Abstract：The presence of chlorine ion will cause harm to the stainless steel, so it is quite necessary to timely and accurately determine the chlorine ion content added into desulfurizer magnesium powder in electrode covering of stainless steel. The sample was dissolved in nitric acid. After adding phenolphthalein indicator, the pH was adjusted to 6-8 with sodium hydroxide solution. The solution was then diluted to 100 mL and transferred into 150 mL beaker. After adding 2 mL of sodium nitrate solution and uniformly mixing, the content of chlorine ion in magnesium powder was directly determined by ion selective electrode method. The experimental results showed that the mass concentration of chlorine ion in range of 0.01-100 mg/L had good linear relationship to the corresponding potential value. The detection limit was 0.005 mg/L. The proposed method was applied for the determination of chlorine ion content in magnesium powder sample. The relative standard deviation (RSD, n=9) was 1.2%. The recovery tests of magnesium powder sample were conducted according to the experimental method. The recoveries were between 94% and 104%. The found results were consistent with those obtained by standard method in National Light Metal Quality Supervision and Inspection Center.
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