There are three types of potassium chloride products: I am a special industrial use of potassium chloride, which is suitable for electrolysis of potassium hydroxide, potassium chlorate, and other industrial use of potassium chloride Π, suitable for a variety of potassium fertilizer production and chemical industry. Class III agriculture uses potassium chloride, which is suitable for the application of compound fertilizer or directly as fertilizer.

　　本文所述的氯化鉀適用于復合肥或直接用作肥料。它以白色或紅色晶體的形式存在，其主要成分為氧化鉀。氯化鉀產品氧化鉀含量檢測時，應注意以下幾個方面:

　　The potassium chloride described in this paper is suitable for compound fertilizer or directly used as fertilizer. It exists in the form of white or red crystal, and its main component is potassium oxide. In the detection of potassium oxide content of potassium chloride products, attention should be paid to the following aspects:

　　溫度控制是配制溶液的首要條件

　　Temperature control is the primary condition of solution preparation

　　根據GB/T 6678-2003《化工產品通用抽樣規則》6.6的規定，在試驗中應確定樣品的抽樣單位數量。采樣器從袋口的一角取樣品袋深的3/4處，將采集到的樣品均勻混合，用四分法將其還原為待測樣品量。由于氯化鉀肥料具有很強的吸水性，在制備樣品時應盡快進行。樣品制備后，稱量5g樣品，取0.001g精度，加入150ml水。然后，樣品在不斷攪拌下加熱，略煮5分鐘。冷卻20℃后，將樣品轉移到500ml的容量瓶中。這是一個關鍵的環節。為了方便一些巡視員，他們并沒有在水溫達到20℃時設置音量，但是當水溫達到20℃時，結果卻很高。當水溫低于20℃時，結果很低。兩個恒定體積導致兩個誤差。因此，準確的測試溫度是測試結果準確性的關鍵。將水溫高于20℃時的試驗結果與水溫為20℃時的試驗結果進行對比，如表1所示。

　　According to 6.6 of general sampling rules for chemical products (GB / T 6678-2003), the number of sampling units shall be determined in the test. The sampler takes samples from one corner of the bag mouth to 3 / 4 of the bag depth, evenly mixes the collected samples, and reduces them to the sample quantity to be measured by quartering method. Because potassium chloride fertilizer has strong water absorption, it should be carried out as soon as possible when preparing samples. After sample preparation, weigh 5g sample, take 0.001g precision, add 150ml water. Then, the sample is heated under constant stirring and boiled for 5 minutes. After cooling to 20 ℃, transfer the sample to a 500 ml volumetric flask. This is a key link. For the convenience of some inspectors, they did not set the volume when the water temperature reached 20 ℃, but when the water temperature reached 20 ℃, the result was very high. When the water temperature is below 20 ℃, the result is very low. Two constant volumes result in two errors. Therefore, accurate test temperature is the key to the accuracy of test results. Compare the test results when the water temperature is higher than 20 ℃ with the test results when the water temperature is 20 ℃, as shown in Table 1.

　　洗滌劑和蒸餾水對試驗結果的影響

　　Influence of detergent and distilled water on test results

　　氧化鉀含量的測定方法與iso2051:1976《氯化鉀的測定-工業用鉀含量-四苯基硼酸鉀的重量法》相同。在弱堿性介質中，四苯基硼鈉[NaB(C6H5)4]堿性溶液和洗滌液直接影響試驗結果。由于制備的四苯基硼鈉很不穩定，容易產生渾濁。如使用前發現渾濁，應先用中速濾紙過濾，否則測試結果過高。洗滌液和蒸餾水的效果也不同。有些檢驗員認為配制洗滌液，用蒸餾水代替洗滌液比較麻煩，檢測結果會比較低。蒸餾水的原始結果與洗滌劑的正確結果的比較如表1所示。

　　The determination method of potassium oxide content is the same as iso2051:1976 determination of potassium chloride content of potassium for industrial use weight method of potassium tetraphenylborate. In the weak alkaline medium, the alkaline solution and washing solution of sodium tetraphenylborate (NAB (C6H5) 4) directly affect the test results. Because the preparation of sodium tetraphenylboron is very unstable, it is easy to produce turbidity. If turbidity is found before use, filter with medium speed filter paper first, otherwise the test result is too high. Washing liquid and distilled water have different effects. Some inspectors think that it is troublesome to replace the detergent with distilled water when preparing the detergent, and the test results will be relatively low. The comparison between the original results of distilled water and the correct results of detergent is shown in Table 1.

　　洗滌步驟是關鍵

　　Washing step is the key

　　試驗中，試驗液過濾后的洗滌步驟存在洗滌終點不清的問題。根據GB 6549-1996氯化鉀的規定，先提取上清液過濾，再用洗滌液(即氯化鉀溶液)將沉淀轉移到過濾器中。，室溫飽和四苯基硼鉀溶液)。上述洗滌液繼續洗滌沉淀約12次，每次洗滌約5ml洗滌液。如果檢查人員沒有清洗足夠的次數，在干燥的坩堝上可以清楚地看到粉紅色物質，這是未清洗的氫氧化鈉和酚酞產生的物質的顏色，終會導致高鉀含量。因此，洗滌次數不應少于12次。將洗滌次數少于12次的原始結果與不少于12次的正確結果進行比較，如表1所示。

　　In the test, there is a problem that the end-point of washing is not clear after the test solution is filtered. According to the provisions of potassium chloride in GB 6549-1996, the supernatant is extracted and filtered first, and then the precipitate is transferred to the filter with the washing solution (i.e. potassium chloride solution). , room temperature saturated potassium tetraphenylboron solution). The above washing solution is washed and precipitated for about 12 times, and each time about 5ml of washing solution is washed. If the inspector does not clean enough times, the pink material can be clearly seen on the dry crucible, which is the color of the material produced by the uncleaned sodium hydroxide and phenolphthalein, which will eventually lead to high potassium content. Therefore, the washing time should not be less than 12 times. Compare the original result of less than 12 times of washing with the correct result of no less than 12 times, as shown in Table 1.

　　結論

　　conclusion

　　綜上所述，在對以氧化鉀為主的氯化鉀產品的檢測中，應充分注意幾個關鍵環節，避免和克服各種可能引起誤差的因素，以保證檢測結果的準確性。

　　In conclusion, in the detection of potassium chloride products mainly composed of potassium oxide, several key links should be paid full attention to to avoid and overcome various factors that may cause errors, so as to ensure the accuracy of the detection results.