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%试样水溶液应无色透明。

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

　　2、铅：取试样1g溶于5ml水和11ml稀盐酸试液的混合液中，冷却。以此作为试样液按GT-18方法测定。对照液中的铅离子量取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、碳酸盐：在含量分析中介于酚酞和甲基橙终点之间所耗的每mL 1mol/L硫酸，相当于碳酸钾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、重金属：取试样670mg，溶于5ml水和5ml稀盐酸试液（TS-117）的混合液中。加热沸，冷却，用水稀释25ml，后过滤。以此作为试样液，按GT-16方法测定。用含20μg铅离子的对照液（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方法测定。标准液和试样液按如下方法制备。

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

　　（1）标准液的制备：按GT-22制各贮液和稀释液，使所得溶液每ml中含汞1μg。取该溶液1ml，放入－50ml烧杯，加水20ml.1:4稀硫酸溶液1ml和4%高锰酸钾溶液1ml。用表面皿盖住烧杯，煮沸数秒钟后冷却，备用。

　　(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）试样液的制备：取试样10.0g放入－100ml烧杯，加水15ml使之溶解，加酚酞试液（TS-167）2滴，在不断搅拌下用1:1稀盐酸溶液缓慢中和。加1:稀硫酸溶液1ml和4%高锰酸钾溶液1ml，用表面皿盖住烧杯，煮沸数秒钟后冷却，备用。

　　(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.

　　以上关于氢氧化钾的质量指标就为大家简单介绍到这里了，如果您还有其它的见解的话，欢迎随时来电咨询。

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