Potassium hydroxide is not unfamiliar to everyone, so what is its quality index? Next, follow Xiaobian to have a brief understanding.

　　1、水不溶物：5%試樣水溶液應無色透明。

　　1. Water insoluble substance: 5% sample solution should be colorless and transparent.

　　2、鉛：取試樣1g溶于5ml水和11ml稀鹽酸試液的混合液中，冷卻。以此作為試樣液按GT-18方法測定。對照液中的鉛離子量取10μg。

　　2. Lead: Take 1g sample and dissolve it in a mixture of 5ml water and 11ml dilute hydrochloric acid, then cool it. The sample solution was determined by GT-18 method. The amount of lead ion in the control solution was 10 ug.

　　3、碳酸鹽：在含量分析中介于酚酞和甲基橙終點之間所耗的每mL 1mol/L硫酸，相當于碳酸鉀138、2mg。

　　3. Carbonate: In content analysis, 1 mol/L sulfuric acid per mL, equivalent to 138 and 2 mg of potassium carbonate, is consumed between the end point of phenolphthalein and methyl orange.

　　4、重金屬：取試樣670mg，溶于5ml水和5ml稀鹽酸試液（TS-117）的混合液中。加熱沸，冷卻，用水稀釋25ml，后過濾。以此作為試樣液，按GT-16方法測定。用含20μg鉛離子的對照液（溶液A）。

　　4. Heavy metals: sample 670 mg, dissolved in 5 ml water and 5 ml dilute hydrochloric acid test solution (TS-117). Heat to boil, cool, dilute to 25 ml with water, and then filter. The sample solution was determined by GT-16 method. The control solution containing 20 mg lead ion (solution A) was used.

　　5、汞：按CT-22方法測定。標準液和試樣液按如下方法制備。

　　5. Mercury: determined by CT-22 method. Standard solution and sample solution are prepared in the following way.

　　（1）標準液的制備：按GT-22制各貯液和稀釋液，使所得溶液每ml中含汞1μg。取該溶液1ml，放入－50ml燒杯，加水20ml.1:4稀硫酸溶液1ml和4%高錳酸鉀溶液1ml。用表面皿蓋住燒杯，煮沸數秒鐘后冷卻，備用。

　　(1) Preparation of standard solution: According to GT-22, each storage liquid and diluent were prepared, so that the obtained solution contained 1 ug of mercury per ml. Take 1 ml of the solution and put it into a beaker of - 50 ml. Add 20 ml.1:4 dilute sulfuric acid solution 1 ml and 4% potassium permanganate solution 1 ml. Cover the beaker with a surface dish and boil for a few seconds before cooling. Set aside.

　　（2）試樣液的制備：取試樣10.0g放入－100ml燒杯，加水15ml使之溶解，加酚酞試液（TS-167）2滴，在不斷攪拌下用1:1稀鹽酸溶液緩慢中和。加1:稀硫酸溶液1ml和4%高錳酸鉀溶液1ml，用表面皿蓋住燒杯，煮沸數秒鐘后冷卻，備用。

　　(2) Preparation of sample solution: 10.0 g of sample was put into - 100 ml beaker, 15 ml of water was added to dissolve the sample, 2 drops of TS-167 was added, and 1:1 dilute hydrochloric acid solution was used to neutralize the sample slowly under continuous stirring. Add 1:1 dilute sulfuric acid solution 1 ml and 4% potassium permanganate solution 1 ml. Cover the beaker with a surface dish, boil for a few seconds, then cool down. Set aside.

　　以上關于氫氧化鉀的質量指標就為大家簡單介紹到這里了，如果您還有其它的見解的話，歡迎隨時來電咨詢。

　　The above quality indicators of potassium hydroxide are briefly introduced here. If you have any other opinions, please feel free to call for advice.