电镀废水中铜锌铬镍对农业环境的影响

Effect of Cu,Zn,Cr and Ni in Electroplating Wastewater on Agricultural Environment.

电镀废水排入河涌会污染农业环境。以广东省南 海市平洲地区为例，农田灌溉水中Ｃｕ、Ｚｎ、Ｎｉ的含量超过允许限值１ ～１４ 倍，河涌底泥Ｃｕ、Ｚｎ、Ｃｒ、Ｎｉ超标１２ ～３７倍，土壤超标０．５ ～２．９倍，作物超标０．３ ～８ 倍。进入河涌的Ｃｕ、Ｚｎ、Ｃｒ、Ｎｉ能较快沉积于底泥中。进入土壤的Ｃｕ、Ｚｎ、Ｃｒ、Ｎｉ主要累积在耕作层中。作物对Ｃｕ、Ｚｎ 的吸收能力远远高于对Ｃｒ、Ｎｉ的吸收能力，作物吸收系数是Ｚｎ ＞ Ｃｕ ＞ Ｎｉ＞

Electroplating wastewater flowing into rivers does pollute the agricultural environment. Take for example Pingzhou of Nanhai City, Guangdong Province, the contents of Cu, Zn and Ni in the irrigation water exceeded the standard by 1～14 times, the contents of Cu, Zn, Cr and Ni in the river bed mud by 12～37 times, in the soil by 0.5～2.9 times and in the crops by 0.3～8 times. The pollutant elements flowing into the rivers deposit quite quickly in the mud, whereas the elements going into the soil are mainly accumulated in the plough layer. Crops absorb much more Cu and Zn than Cr and Ni showing the absorption coefficients in such a decreasing sequence as Zn>Cu>Ni>Cr.