果树防病常须大量硫酸铜,而现有分析硫酸铜的方法对含硫酸亚铁过多的劣质硫酸铜滴定终点不明显。作者经过试验,提出一个新的速测法,可用于农村等条件不具备的单位,能快速、准确得其基本含量。其原理是CuSO_4·5H_2O溶于水后,加浓氨水,应显Cu(NH_3)_4~(2+)络离子的纯兰色;而其中的杂质Fe~(++)在碱性条件下则显深黑色。测定方法是:首先配好硫酸铜-硫酸亚铁6级色阶标准 Fruit tree disease often require large amounts of copper sulfate, and the existing method of analysis of copper sulfate is too obvious for the titration endpoint of inferior copper sulfate containing ferrous sulfate. After testing, the author put forward a new rapid test method, which can be used in the units that rural areas do not have, and can quickly and accurately obtain its basic content. The principle is CuSO_4 · 5H_2O dissolved in water, add concentrated ammonia, should be Cu (NH_3) _4 ~ (2+) complex ions of pure blue; and the impurity Fe ~ (++) in alkaline conditions then Deep black. Determination method is: first with a good copper sulfate - ferrous sulfate level 6 color standards