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mm1988新蟲 (小有名氣)
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[求助]
bp中碘的檢測
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BP中碘的檢測加入碘化鉀,這是為什么,另外最后結(jié)果是怎么計算的? To 10 mL of the injection add sufficient water to produce 50 mL. Add 2.0 mL of 0.001M potassium iodide. Carry out the method for potentiometric titration, Appendix VIII B, using 0.001M silver nitrate VS, a silver indicator electrode and an appropriate reference electrode. Subtract the volume of titrant corresponding to the 2.0 mL of 0.001Mpotassium iodide, determined by titrating a blank to which is added 2.0 mL of 0.001M potassium iodide, and use the residual value to calculate the iodide content. 1 mL of 0.001M silver nitrate VS is equivalent to 126.9 μg of iodide. Not more than 2.0 mL of 0.001M silver nitrate VS is required (40 ppm). 請神通廣大的蟲友指教 |
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