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目的对西北干旱生态环境下生活饮用水的总硬度以及氯化物(Cl-)、硝酸盐(以N计)(NO-3)和硫酸盐(SO2-4)等部分阴离子含量进行统计分析,并分析总硬度与阴离子之间的数量关系。方法按照生活饮用水标准检验方法,对112份水样中的总硬度、Cl-、NO-3和SO2-4等指标进行检验,以总硬度为因变量,以Cl-、NO-3和SO2-4指标为自变量,进行多重线性回归分析。结果总硬度、Cl-、NO-3和SO2-4等指标的含量(x±s)分别为(302±12)mg/L、(38.57±8.73)mg/L、(2.02±0.27)mg/L和(105.49±10.50)mg/L,合格率分别为92.86%、98.21%、99.11%和89.29%,进行多重线性回归分析,总硬度与Cl-、NO-3和SO2-4的相关系数r分别为0.630、0.390和0.717,建立的多重线性回归方程的检验结果为F=64.484,差异有统计学意义(P<0.05)。全变量回归分析的决定系数r2=0.542,调整决定系数r2=0.534。结论西北干旱生态环境下生活饮用水的总硬度较高,与Cl-、NO-3和SO2-4等指标关系较为密切。
Objective To analyze the total hardness of drinking water and the contents of some anions such as chloride (Cl-), nitrate (NO-3) and sulfate (SO2-4) in northwest arid ecological environment, Analysis of the total hardness and the relationship between the number of anions. Methods The total hardness, Cl-, NO-3 and SO2-4 in 112 water samples were tested according to the standard test method for drinking water. The total hardness was taken as the dependent variable and the contents of Cl-, NO-3 and SO2 -4 indicators as independent variables, multiple linear regression analysis. Results The contents of total hardness, Cl-, NO-3 and SO2-4 were (302 ± 12) mg / L, (38.57 ± 8.73) mg / L and (2.02 ± 0.27) mg / L and (105.49 ± 10.50) mg / L respectively, with pass rates of 92.86%, 98.21%, 99.11% and 89.29%, respectively. Multiple linear regression analysis was performed. The correlation coefficients of total hardness with Cl-, NO-3 and SO2-4 Respectively 0.630,0.390 and 0.717, the established multiple linear regression equation test results F = 64.484, the difference was statistically significant (P <0.05). The determination coefficient of full-variable regression analysis r2 = 0.542, adjustment decision coefficient r2 = 0.534. Conclusion The total hardness of domestic drinking water in the arid ecological environment in Northwest China is relatively high, which is closely related to the indexes of Cl-, NO-3 and SO2-4.