who飲用水指南第四版與生活用水衛(wèi)生標(biāo)準(zhǔn)gb5749-20xx的限度值比較20xx01-文庫吧在線文庫
【正文】 ed lowest reported odour threshold 微囊藻毒素 LR（ mg/L） 感官性狀和一般化學(xué)指標(biāo) 氨氮（以 N 計(jì)， mg/L） Just mentioned in the ANNEX 5: Breakpoint chlorination is a method in which the chlorine dose is sufficient to rapidly oxidize all the ammonia nitrogen in the water and to leave a suitable free residual chlorine available to protect the water against reinfection from the point of chlorination to the 7 point of use. 硫化物（ mg/L） Na value 鈉（ mg/L） 200 Not of health concern at levels found in drinkingwater. May affect acceptability of drinking water. The average taste threshold for sodium is about 200 mg/l. 表 4 農(nóng)村小型集中式供水和分散式供水部分水質(zhì)指標(biāo)及限值 指 標(biāo) 限 值 WHO value 微生物指標(biāo) 菌落總數(shù)（ CFU/mL） 500 No value 毒理指標(biāo) 砷 （ mg/L） (A, T) 氟化物（ mg/L） 硝酸鹽（以 N 計(jì)， mg/L） 20 50 感官性狀和一般化學(xué)指標(biāo) 色度（鉑鈷色度單位） 20 No healthbased guideline value is proposed for colour in drinkingwater 渾濁度（ NTU散射濁度單位） 3 水源與凈水技術(shù)條件限制時(shí)為 5 Turbidity is measured by nephelometric turbidity units (NTU) and can be initially noticed by the naked eye above approximately NTU. However, to ensure effectiveness of disinfection, turbidity should be no more than 1 NTU and preferably much lower. Large, wellrun municipal supplies should be able to achieve less than NTU before disinfection at all times and should be able to average NTU or less. pH（ pH 單位） 不小于 且不大于 No healthbased guideline value has been proposed for pH. The optimum pH required will vary in different supplies according to the position of the water and the nature of the construction materials used in the distribution system, but it is usually in the range – 溶解性總固體（ mg/L） 1500 The palatability of water with a total dissolved solids (TDS) level of less than about 600 mg/l is generally considered to be good。 ② 放射性指標(biāo)超過指導(dǎo)值，應(yīng)進(jìn)行核素分析和評(píng)價(jià)，判定能否飲用。 0 WHO 飲用水指南 （第四版） 與生活用水衛(wèi)生標(biāo)準(zhǔn) GB57492020 的限度值比較 1 表 1 水質(zhì)常規(guī) 指標(biāo) 及限值 指 標(biāo) 限 值 WHO value 微生物指標(biāo) ① 總大腸菌群（ MPN/100mL 或 CFU/100mL） 不得檢出 不得檢出 耐熱大腸菌群（ MPN/100mL 或 CFU/100mL） 不得檢出 不得檢出 大腸埃希氏菌（ MPN/100mL 或 CFU/100mL） 不得檢出 不得檢出 菌落總數(shù)（ CFU/mL） 100 No value 毒理指標(biāo) 砷（ mg/L） (A, T) 鎘（ mg/L）
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