IWA Publishing

Table 3 shows regular parameters and macro-elements of drinking water in longevity areas and non-longevity areas in South China as well as non-longevity areas in North China.

Table 3

Statistical summary of physico-chemical parameters in drinking waters of China

	Longevity in South n = 40		Non-longevity in South n = 74		Non-longevity in North n = 14
Elements	Range	Median	Range	Median	Range	Median	GB 5749-2006 (MHPRC 2006)	WHO (WHO 2011)
pH	6.62 ∼ 8.01	7.42	5.17 ∼ 9.18	7.07	7.42 ∼ 8.38	7.71	6.5–8.5	6.5–9.5
EC	37.1 ∼ 1,536	329	10.33 ∼ 1,146	40.6	286 ∼ 2,430	699.50
Eh	195 ∼ 337	231	120 ∼ 355	252	193 ∼ 290	225
TDS	35.43 ∼ 1,014.66	209.02	18.41 ∼ 719.28	47.97	172.16 ∼ 1,725.65	441.44	1,000	1,000
TH	20.14 ∼ 595.13	157.82	0.63 ∼ 471.15	14.61	59.2 ∼ 755.81	291.69	450	500
HCO⁻₃	28.3 ∼ 737.74	189.67	3.58 ∼ 459.97	21.57	151.75 ∼ 662.96	337.48
Ca	6.44 ∼ 138.1	50.84	0.17 ∼ 125.8	2.63	21.31 ∼ 120.5	49.56
K	0.05 ∼ 62.52	1.31	0.13 ∼ 17.78	1.45	0.31 ∼ 8.35	1.28
Mg	0.95 ∼ 71.89	2.89	0.05 ∼ 38.15	1.77	1.46 ∼ 128.1	31.02
Na	0.28 ∼ 122.3	4.56	0.35 ∼ 76.4	2.95	28.67 ∼ 241.3	51.63	200	200
SiO₂	2.64 ∼ 48.17	9.89	2.02 ∼ 34.55	17.70	16.35 ∼ 28.49	19.26
Cl	0.84 ∼ 148.57	3.26	0.16 ∼ 112.91	1.86	<0.1 ∼ 401.06	35.73	250	250
SO²⁻₄	0.2 ∼ 124.9	7.43	<0.1 ∼ 102.9	1.70	5.23 ∼ 639.9	35.44	250	500
NO⁻₃	<0.1 ∼ 121.93	5.15	<0.1 ∼ 90.28	1.56	0.13 ∼ 51.59	0.57	44.3	50

	Longevity in South n = 40		Non-longevity in South n = 74		Non-longevity in North n = 14
Elements	Range	Median	Range	Median	Range	Median	GB 5749-2006 (MHPRC 2006)	WHO (WHO 2011)
pH	6.62 ∼ 8.01	7.42	5.17 ∼ 9.18	7.07	7.42 ∼ 8.38	7.71	6.5–8.5	6.5–9.5
EC	37.1 ∼ 1,536	329	10.33 ∼ 1,146	40.6	286 ∼ 2,430	699.50
Eh	195 ∼ 337	231	120 ∼ 355	252	193 ∼ 290	225
TDS	35.43 ∼ 1,014.66	209.02	18.41 ∼ 719.28	47.97	172.16 ∼ 1,725.65	441.44	1,000	1,000
TH	20.14 ∼ 595.13	157.82	0.63 ∼ 471.15	14.61	59.2 ∼ 755.81	291.69	450	500
HCO⁻₃	28.3 ∼ 737.74	189.67	3.58 ∼ 459.97	21.57	151.75 ∼ 662.96	337.48
Ca	6.44 ∼ 138.1	50.84	0.17 ∼ 125.8	2.63	21.31 ∼ 120.5	49.56
K	0.05 ∼ 62.52	1.31	0.13 ∼ 17.78	1.45	0.31 ∼ 8.35	1.28
Mg	0.95 ∼ 71.89	2.89	0.05 ∼ 38.15	1.77	1.46 ∼ 128.1	31.02
Na	0.28 ∼ 122.3	4.56	0.35 ∼ 76.4	2.95	28.67 ∼ 241.3	51.63	200	200
SiO₂	2.64 ∼ 48.17	9.89	2.02 ∼ 34.55	17.70	16.35 ∼ 28.49	19.26
Cl	0.84 ∼ 148.57	3.26	0.16 ∼ 112.91	1.86	<0.1 ∼ 401.06	35.73	250	250
SO²⁻₄	0.2 ∼ 124.9	7.43	<0.1 ∼ 102.9	1.70	5.23 ∼ 639.9	35.44	250	500
NO⁻₃	<0.1 ∼ 121.93	5.15	<0.1 ∼ 90.28	1.56	0.13 ∼ 51.59	0.57	44.3	50

Unit: mg/L except EC (μS/cm) and Eh (mv).

n: number of samples.

TDS: total dissolved solids; TH: total hardness.

View Large

This Feature Is Available To Subscribers Only