铝卷生产要经过一系列的处理，在这个过程中会产生一部分工业废水，这些废水排出后，都会流入江河海。但是这些废水中含有很多的金属离子，有些是对人体有害的，要经过处理才能够终排除。那么要如何检测处理废水中的金属离子呢?
Aluminum coil production needs a series of treatment. In this process, some industrial wastewater will be generated. After discharged, these wastewater will flow into rivers and seas. However, these wastewater contain a lot of metal ions, some of which are harmful to human body, and can be finally eliminated only after treatment. So how to detect and treat metal ions in wastewater?
Na离子的含量是通过测定碱的量来推算，用酚酞作指示剂，盐酸标准溶液滴定至溶液的红色消失为终点，由消耗的盐酸量计算氢氧化的量，从而算出钠离子的含量。2价Na离子的含量采用在柠檬酸盐的氨性介质中，用丁二酮肟显色，在450nm处测定其吸光度，以纯镍作标准曲线，计算其含量。

The content of Na ion is calculated by measuring the amount of alkali, using phenolphthalein as indicator, titrating hydrochloric acid standard solution until the red of the solution disappears as the end point, and calculating the amount of hydrogen oxidation from the amount of hydrochloric acid consumed, so as to calculate the content of sodium ion. The content of divalent Na ion is developed with dimethylglyoxime in the ammonia medium of citrate, the absorbance is measured at 450 nm, and the content is calculated with pure nickel as the standard curve.
有社会责任感的铝卷生产厂家都会主动检测自身废水中的金属离子，在确定其含量不会对人体造成大的伤害之后，才会将废水排出。同时，政府也将对铝卷生产的企业进行监测，保证对环境和人民人身安全的保护。
Aluminum coil manufacturers with a sense of social responsibility will actively detect the metal ions in their own wastewater and discharge the wastewater only after determining that their content will not cause great harm to human body. At the same time, the government will also monitor the enterprises producing aluminum coils to ensure the protection of the environment and people's personal safety.