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本实验通过对自来水反复煮沸,分别在煮沸0、1、10、20、40、80、120次进行取样,通过电感耦合等离子体质谱联用仪测定水质常规指标的阳离子:Na~+、Al3~(3+)、Ca~(2+)、Cr~+、Mn~(2+)、Fe~(3+)、Cu~(2+)、Zn~+、As~+、Se~+、Cd~+、Hg~+、Pb~(2+);离子色谱仪测定水质常规指标的阴离子:F~-、Cl~-、NO_2~-、NO_3~-、SO_4~(2-)。实验结果表明,自来水中的阴阳离子浓度均随着沸腾的次数增加而增大。尽管沸腾次数达到120次,自来水中本来含有的阴阳离子浓度也不断增大,但均没有超过《生活饮用水卫生标准》规定的限值。
In this experiment, the tap water was repeatedly boiled and sampled at 0, 1, 10, 20, 40, 80 and 120 times respectively for boiling to determine the cations of conventional indicators of water quality by inductively coupled plasma mass spectrometry: Na ~ +, (3 +), Ca 2+, Cr 2+, Mn 2+, Fe 3+, Cu 2+, Zn +, As +, Se +, Cd ~ +, Hg ~ +, Pb ~ (2+); Determination of anion, F ~ -, Cl ~ -, NO_2 ~ -, NO_3 ~ -, SO_4 ~ (2-) in routine indicator of water quality by ion chromatography. Experimental results show that the concentration of anion and cation in tap water increases with the increase of boiling time. Although the number of boiling reached 120 times, the concentration of anions and cations originally contained in tap water has also been increasing, but none of them exceeds the limits of the standard of drinking water health.