River	Ca++	Mg++	Na+	K+	Cl-	SO4--	HCO3-	SiO2	TDS	Discharge
-	mg/l	mg/l	mg/l	mg/l	mg/l	mg/l	mg/l	mg/l	mg/l	km3/yr
Colorado	83	24	95	5	82	270	135	9.3	703	20
Columbia	19	5.1	6.2	1.6	3.5	17.1	76	10.5	139	250
Mackenzie	33	10.4	7	1.1	8.9	36.1	111	3	211	304
St. Lawrence	25	3.5	5.3	1	6.6	14.2	75	2.4	133	337
Yukon	31	5.5	2.7	1.4	0.7	22	104	6.4	174	195
Mississippi	34	8.9	11	2.8	10.3	25.5	116	7.6	216	580
Frazer	16	2.2	1.6	0.8	0.1	8	60	4.9	93	100
Nelson	33	13.6	24	2.4	30.2	31.4	144	2.6	281	110
Rio Grande	109	24	117	6.7	171	238	183	30	881	2.4
Danube	49	9	9	1	19.5	24	190	5	307	203
Lower Rhine	84	10.8	99	7.4	178	78	153	5.5	256	68.9
Norwegian rivers	3.6	0.9	2.8	0.7	4.2	3.6	12	3	31	383
Black Sea-Azov rivers	43	8.6	17.1	1.3	16.5	42	136	0	265	158
Lower Amazon	5.2	1	1.5	0.8	1.1	1.7	20	7.2	38	7245
Lower Negro	0.2	0.1	0.4	0.3	0.3	0.2	0.7	4.1	6	1383
Madeira	5.6	0.2	2.6	1.6	0.8	5.6	28	9.4	53	1550
Parana	5.4	2.4	5.5	1.8	5.9	3.2	31	14.3	69	567
Magdalena	15	3.3	8.3	1.9	13.4	14.4	49	12.6	118	235
Guyana rivers	2.6	1.1	2.6	0.8	3.9	2	12	10.9	36	240
Orinoco	3.3	1	1.5	0.65	2.9	3.4	11	11.5	34	946
Zambeze	9.7	2.2	4	1.2	1	3	25	12	58	224
Congo	2.4	1.3	1.7	1.1	2.9	3	11	9.8	33	1230
Niger	4.1	2.6	3.5	2.4	1.3	1	36	15	66	190
Nile	25	7	17	4	7.7	9	134	21	225	83
Orange	18	7.8	13.4	2.3	10.6	7.2	107	16.3	183	10
Brahmaputra	17	2.9	3.7	3.1	3.8	9.6	5.4	7.3	101	603
Ganges	24.5	5	4.9	3.1	3.4	8.5	105	12.8	167	450
Mekong	14.2	3.2	3.6	2	5.3	3.8	58	8.9	99	577
Japanese rivers	8.8	1.9	6.7	2.2	5.8	10.6	31	19	86	550
New Zealand rivers	8.2	4.6	5.6	0.7	5.8	6.2	50	7	88	400
Yangtze (Chiang)	45	6.4	4.1	1.2	4.1	17.9	148	5.8	232	1063
Yellow (Hwang Ho)	50	22	49	2.4	40	73	226	5.8	467	49
Philippines	31	6	10.4	1.7	3.9	13.6	131	30.4	228	332

World natural (unpolluted)	13.4	3.4	5.2	1.3	5.8	8.3	52	10.4	99.6	37.4 x10e3