碱性过硫酸钾的配制方法:

Preparation method of alkaline potassium persulfate:

称取40g过硫酸钾，15g氢氧化钠，溶于无氨水中，稀释1000mL。而HJ636—2012中则明确指出，2种溶液需分开配制，且要等到氢氧化钠溶液冷却到室温后，再将2种溶液混匀。

Weigh 40g of potassium persulfate and 15g of sodium hydroxide, dissolve them in ammonia free water, and dilute to 1000mL. In HJ636-2012, it is explicitly stated that the two solutions need to be prepared separately and must wait until the sodium hydroxide solution cools to room temperature before mixing the two solutions evenly.

这是由于氢氧化钠溶于水时会发热，若将过硫酸钾和氢氧化钠同时放入烧杯中溶解，部分过硫酸钾会因氢氧化钠放热导致局部温度过高而失效，所以，在配制碱性过硫酸钾溶液时，必须按HJ636—2012的规定进行。

This is because sodium hydroxide will generate heat when dissolved in water. If potassium persulfate and sodium hydroxide are dissolved in a beaker at the same time, some potassium persulfate will become ineffective due to excessive local temperature caused by the heat release of sodium hydroxide. Therefore, when preparing alkaline potassium persulfate solution, it is necessary to follow the regulations of HJ636-2012.

过硫酸钾常温下不易完全溶解，在配制时常常通过加热促进溶解，但过硫酸钾在60℃甚50℃就会分解，故加热温度应控制在50℃以下为宜。

Potassium persulfate is not easily dissolved at room temperature and is often promoted by heating during preparation. However, potassium persulfate decomposes at 60 ℃ or even 50 ℃, so the heating temperature should be controlled below 50 ℃.

配制碱性过硫酸钾溶液应注意:

When preparing alkaline potassium persulfate solution, attention should be paid to:

①分别溶解过硫酸钾和氢氧化钠，待两种试剂冷却室温再混合;

① Dissolve potassium persulfate and sodium hydroxide separately, wait for the two reagents to cool to room temperature before mixing;

②配制过硫酸钾溶液需加热溶解，但温度一定要控制在60℃以下，防止过硫酸钾分解失效;

② The preparation of potassium persulfate solution requires heating for dissolution, but the temperature must be controlled below 60 ℃ to prevent the decomposition and failure of potassium persulfate;

③溶液现用现配，长放置时间不超过3天，而且消解时加入碱性过硫酸钾的量必须准确。

③ The solution should be prepared immediately and stored for no more than 3 days. The amount of alkaline potassium persulfate added during digestion must be accurate.

过硫酸钾作为氧化剂，应避免与还原性物质、硫、磷等混合存放，且要放在干燥的地方，不能存放太久。

Potassium persulfate, as an oxidant, should be stored in a dry place and should not be mixed with reducing substances, sulfur, phosphorus, etc. It should not be stored for too long.

碱性过硫酸钾溶液更不能长期存放，标准中规定碱性过硫酸钾溶液在聚乙烯瓶中存放不能超过7d。碱性过硫酸钾在27～30℃环境下，存放超过3d，空白值就会大于0.030;建议实验时尽量根据3d的需求量配制，存放尽量不要超过3d。您有什么疑惑或者需求，欢迎您随时来我们网站http://www.jinhao360.com咨询！

Alkaline potassium persulfate solution cannot be stored for a long time. The standard stipulates that alkaline potassium persulfate solution cannot be stored in polyethylene bottles for more than 7 days. When alkaline potassium persulfate is stored in an environment of 27-30 ℃ for more than 3 days, the blank value will be greater than 0.030; It is recommended to prepare according to the demand for 3D as much as possible during the experiment, and store it as little as possible beyond 3D. If you have any doubts or needs, please feel free to come to our website at any time http://www.jinhao360.com consulting service