順酐廠家提醒您，過(guò)硫酸鉀溶液更不能長(zhǎng)期存放，標(biāo)準(zhǔn)中規(guī)定堿性過(guò)硫酸鉀溶液在聚乙烯瓶中存放不能超過(guò)7d。堿性過(guò)硫酸鉀在27～30℃環(huán)境下，存放超過(guò)3d，空白值就會(huì)大于0.030建議實(shí)驗(yàn)時(shí)盡量根據(jù)近3d的需求量配制，存放盡量不要超過(guò)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.
過(guò)硫酸鉀存放時(shí)間：
Storage time of potassium persulfate:
過(guò)硫酸鉀作為氧化劑，應(yīng)避免與還原性物質(zhì)、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.
過(guò)硫酸鉀溶液存放條件：
Storage conditions for potassium persulfate solution:
儲(chǔ)存于陰涼、干燥、通風(fēng)良好的庫(kù)房。遠(yuǎn)離火種、熱源。包裝密封。應(yīng)與還原劑、活性金屬粉末、堿類(lèi)、醇類(lèi)等分開(kāi)存放，切忌混儲(chǔ)。
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.
過(guò)硫酸鉀溶液保質(zhì)期：
Shelf life of potassium persulfate solution:
一周。過(guò)硫酸鉀具有強(qiáng)氧化性，不穩(wěn)定，易分解，放出氧變?yōu)榻沽蛩徕洠?00℃時(shí)完全分解，其溶液長(zhǎng)期貯存濃度會(huì)改變。
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.
堿性過(guò)硫酸鉀的配制方法:
Preparation method of alkaline potassium persulfate:
稱(chēng)取40g過(guò)硫酸鉀，15g氫氧化鈉，溶于無(wú)氨水中，稀釋1000mL。而HJ636—2012中則明確指出，2種溶液需分開(kāi)配制，且要等到氫氧化鈉溶液冷卻到室溫后，再將2種溶液混勻。這是由于氫氧化鈉溶于水時(shí)會(huì)發(fā)熱，若將過(guò)硫酸鉀和氫氧化鈉同時(shí)放入燒杯中溶解，部分過(guò)硫酸鉀會(huì)因氫氧化鈉放熱導(dǎo)致局部溫度過(guò)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，在配制堿性過(guò)硫酸鉀溶液時(shí)，必須按HJ636—2012的規(guī)定進(jìn)行。過(guò)硫酸鉀常溫下不易完全溶解，在配制時(shí)常常通過(guò)加熱促進(jìn)溶解，但過(guò)硫酸鉀在60℃甚50℃就會(huì)分解，故加熱溫度應(yīng)控制在50℃以下為宜。
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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