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Cu(Ⅲ)在碱性介质中具有强的氧化力。样品与过量Cu(Ⅲ)试剂在加热回流的条件下,能将一些有机物定量氧化成二氧化碳和水,对具有还原性的无机物亦能进行定量氧化。为此,可用它来进行一些有关物质的含量测定。该法终点敏锐、重现性好,检出量可达到1×10~(-4)克,是适用于微量测定的容量分析。Ⅰ实验部分一、试剂硫酸铜 AR 亚碲酸钾 AR 高硫酸钾 AR 氢氧化钠 AR 碳酸氢钠 AR 基准亚砷酸钠溶液 0.08000N 标准碘溶液约0.01N 硫酸 0.5M 淀粉指示剂二、Cu(Ⅲ)试剂的配制与标定称取硫酸铜1.561克于250毫升烧坏中,加亚碲酸钾3.173克,高硫酸钾4.220克、氢
Cu (Ⅲ) has strong oxidizing power in alkaline medium. Samples and excess Cu (III) reagent under reflux conditions, some organic compounds can be quantitatively oxidized to carbon dioxide and water, on the reduction of inorganic substances can also be quantitative oxidation. To this end, it can be used to carry out some related substances determination. The method has sharp end point and good reproducibility. The detection capacity can reach 1 × 10 ~ (-4) g, which is a capacity analysis suitable for trace determination. Ⅰ Experimental Part I. Reagents Copper sulphate AR Potassium telluride AR Potassium AR potassium sulphate AR Sodium hydroxide AR Sodium bicarbonate AR Standard sodium arsenite solution 0.08000N Standard iodine solution About 0.01N Sulfuric acid 0.5M Starch indicator II Cu Ⅲ) Reagent preparation and calibration Weigh 1.561 grams of copper sulfate in 250 ml of burn, plus potassium tellurite 3.173 grams, 4.220 grams of potassium sulfate, hydrogen