顺酐生产厂家提醒您，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近3d的需求量配制，存放尽量不要超过3d。
The maleic anhydride manufacturer reminds you that potassium persulfate solution cannot be stored for a long time. According to the standard, alkaline potassium persulfate solution cannot be stored in polyethylene bottles for more than 7 days. When alkaline potassium persulfate is stored at 27 to 30 ℃ for more than 3 days, the blank value will be greater than 0.030. It is recommended to prepare it according to the demand for nearly 3 days during the experiment and try not to store it for more than 3 days.
过硫酸钾存放时间：
Storage time of potassium persulfate:
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。
As an oxidant, potassium persulfate should not be stored mixed with reducing substances, sulfur, phosphorus, etc., and should be stored in a dry place, not for too long.
过硫酸钾溶液存放条件：
Storage conditions for potassium persulfate solution:
储存于阴凉、干燥、通风良好的库房。远离火种、热源。包装密封。应与还原剂、活性金属粉末、碱类、醇类等分开存放，切忌混储。
Store in a cool, dry, well ventilated warehouse. Keep away from kindling and heat sources. Packaging sealed. It should be stored separately from reducing agents, active metal powders, alkalis, alcohols, etc., and should not be stored together.
过硫酸钾溶液保质期：
Shelf life of potassium persulfate solution:
一周。过硫酸钾具有强氧化性，不稳定，易分解，放出氧变为焦硫酸钾，100℃时完全分解，其溶液长期贮存浓度会改变。
One week. Potassium persulfate has a strong oxidizing property, is unstable, and is easy to decompose. It emits oxygen and becomes potassium pyrosulfate, which is completely decomposed at 100 ℃. Its solution concentration may change during long-term storage.
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。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。
Weigh 40 g of potassium persulfate and 15 g of sodium hydroxide, dissolve them in ammonia free water, and dilute to 1000 mL. HJ636-2012 clearly states that the two solutions need to be prepared separately, and it is necessary to wait until the sodium hydroxide solution cools to room temperature before mixing the two solutions evenly. This is due to the heat generated when sodium hydroxide is dissolved in water. If potassium persulfate and sodium hydroxide are dissolved simultaneously in a beaker, some potassium persulfate will become ineffective due to excessive local temperature due to the heat release of sodium hydroxide.
所以，在配制碱性过硫酸钾溶液时，必须按HJ636—2012的规定进行。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。
Therefore, when preparing alkaline potassium persulfate solution, it is necessary to follow the provisions of HJ636-2012. Potassium persulfate is not easy to completely dissolve at room temperature, and it is often promoted by heating during preparation. However, potassium persulfate can decompose at 60 ℃ or even 50 ℃, so the heating temperature should be controlled below 50 ℃.
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