标准摘要
[中文适用范围]： ISO 7027 的这一部分规定了两种使用光学浊度计或浊度计测定水浊度的定量方法： a) 浊度测定法：测量颗粒散射辐射（散射辐射）的方法，适用于低浊度水（例如饮用水）； b) 比浊法：测量穿过的辐射衰减的方法。 它们更适合非常浑浊的水（例如废水或含有悬浮物的水）。 第一种方法测量的浊度以比浊法浊度单位 (NTU) 报告。 结果通常在 < 0.05 NTU 和 400 NTU 之间。 根据设备设计，还可以测量更浑浊的水。 NTU 单位和福尔马肼浊度单位（FNU，en：福尔马肼浊度单位）在数值上相等。 通过第二种方法测量的浊度以福尔马肼衰减单位 (FAU) 报告；结果通常在 40 FAU 到 4000 FAU 之间。 [外文原描述]： ISO 7027-1:2016 specifies two quantitative methods using optical turbidimeters or nephelometers for the determination of turbidity of water: a) nephelometry, procedure for measurement of diffuse radiation, applicable to water of low turbidity (for example drinking water); b) turbidimetry, procedure for measurement of the attenuation of a radiant flux, more applicable to highly turbid waters (for example waste waters or other cloudy waters). Turbidities measured according to the first method are presented as nephelometric turbidity units (NTU). The results typically range between <0,05 NTU and 400 NTU. Depending on the instrument design, it can also be applicable to waters of higher turbidity. There is numerical equivalence of the units NTU and formazin nephelometric unit (FNU). Turbidity measured by the second method is expressed in formazin attenuation units (FAU), results typically range between 40 FAU and 4 000 FAU.
英文名称Water quality — Determination of turbidity — Part 1: Quantitative methods