Hydrochemical survey

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The data of the extensive groundwater survey in the Red River (Vietnam) is presented as a hydrochemical atlas comprising 42 different chemical parameters. We found that 65% of all studied wells exceed the WHO guideline values for arsenic, manganese, barium, selenium or a combination of these elements. Correspondingly, geogenic groundwater pollution in the Red River delta poses a serious long-term health threat to about 7 million people. This is particularly worrying since groundwater is the main source of drinking water.

Database

• Hydrochemical database RRD Vietnam [xls]

Quality assurance and quality control of chemical analyses

• QAQC RRD Vietnam [pdf]

Hydrochemical Atlas

Topography		Sampling Dates		Sample locations		Depths of wells
		Arsenic (<0.5 to >50 µg/L)		Arsenic (<5 to >200 µg/L)
Alkalinity		Aluminium		Ammonium		Barium
Boron		Bromine		Cadmium		Calcium
Cloride		Chromium		Cobalt		Copper
Dissolved organic carbon		Dissolved organic oxygen		Electrical conductivity		Iron
Lead		Magnesium		Manganese		Mercury
Nickel		Nitrate		pH		Phosphate
Potassium		Redox potential		Silicon		Selenium
Sodium		Sulphate		Uranium		Zinc