Copper sulphate, commonly known as "blue peony," is a commonly used pesticide in the fruit industry. In recent years, due to the shortage of drug sources, there have been some poor quality products on the market. These products often contain a large amount of harmful impurities such as ferrous sulfate, and often cause harm to fruit trees after use. Therefore, it is best to use it when it is used. Its simple identification method is as follows:
1. Appearance identification. Using a multi-point sampling method, a copper sulfate sample was taken and its crystal color was observed. Pure copper sulfate is a triclinic crystal, and its crystal block should be blue. If it contains impurities such as sodium and magnesium, the color of the crystal block will gradually become lighter as the impurity content increases. If iron is contained, its crystal color is often blue-green, yellow-green or light green, and its color varies. Good quality copper sulfate can be used as a reference for observation.
2. Chemical identification. 1 Take 1 g (about the size of peanuts) of each copper sulfate sample to be tested in advance and the pure product, put them into two cups, add 100 ml of clean water and shake it for a few minutes to completely dissolve the crystal pieces. 2 Measure about 5 ml of each of the above turbid liquids, place them in two glasses respectively, add about 0.5 g of ammonium bicarbonate, shake them for 1 to 2 minutes, make them fully react, develop color, and place them for 10 minutes. Compare. If the two solutions have the same color, no precipitation and few precipitates, the quality of the sample is proved to be acceptable; if the blue color of the sample solution to be tested is significantly lighter than that of the pure product, the content of the active ingredient is low and may contain part of sodium. , Mg, K and other impurities; If a large number of precipitates in the sample, it shows that the sample contains more iron, aluminum, zinc or calcium and other impurities, the more precipitation, the lower its active ingredient.
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