Citation:

PANGAEA.974221 (dataset in review)

Name: Hydrochemistry and isotope data from groundwater monitoring wells in the Mekong Delta, Vietnam
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Carbon isotopes; groundwater geochemistry; Mekong delta; multi-layered aquifer; radiocarbon dating; Vietnam

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Abstract:

A total of 119 groundwater samples were collected across the Mekong Delta in Vietnam for hydrochemical and isotopic analysis (major ions, secondary elements, δ2H-H2O, δ18O-H2O, δ13C-DIC, 14C-DIC). The campaign comprised samples from five deep, (semi-)confined aquifers of the Mekong Delta and was conducted in March and April 2021 at monitoring wells of the National Groundwater Monitoring Network in cooperation with the Division of Water Resources Planning and Investigation in the South of Vietnam (DWRPIS). At each well, about three well volumes of groundwater were pumped with a submersible pump and field parameters were measured using a flow cell. A set of five bottles was taken for analysis of cations and secondary elements (PET), anions and alkalinity (PET), dissolved organic carbon (DOC) (glass with aluminum cap), stable isotopes of water (glass), and carbon isotopes (HDPE). Water for cations and secondary elements was passed through 0.45 µm cellulose acetate filters and acidified with ultrapure nitric acid (Merck) to pH<2. The main objective of the project was to assess the impact of groundwater abstraction on groundwater flow and water quality in the different aquifers.

Keyword(s):

Carbon isotopes; groundwater geochemistry; Mekong delta; multi-layered aquifer; radiocarbon dating; Vietnam

Related to:

Osenbrück, Karsten; et al. (submitted): Geochemical evolution and flow of groundwater impacted by long-term abstraction in the Mekong Delta, Vietnam.

Coverage:

Median Latitude: 9.806657 * Median Longitude: 105.744918 * South-bound Latitude: 8.760100 * West-bound Longitude: 104.699370 * North-bound Latitude: 10.734670 * East-bound Longitude: 106.649770

Date/Time Start: 2021-03-22T00:00:00 * Date/Time End: 2021-04-15T00:00:00

Minimum DEPTH, sediment/rock: 61 m * Maximum DEPTH, sediment/rock: 502 m

Event(s):

Q17704TM1 (Aquifer_n22) * Latitude: 9.192840 * Longitude: 105.150760 * Date/Time: 2021-03-24T00:00:00 * Elevation: 1.2 m * Location: Ca Mau * Campaign: (Groundwater Monitoring) * Basis: Sampling on land * Method/Device: Water pump (PUMP) * Comment: Groundwater monitoring well

Q17704ZM1 (Aquifer_n21) * Latitude: 9.192745 * Longitude: 105.150887 * Date/Time: 2021-03-24T00:00:00 * Elevation: 1.2 m * Location: Ca Mau * Campaign: (Groundwater Monitoring) * Basis: Sampling on land * Method/Device: Water pump (PUMP) * Comment: Groundwater monitoring well

Q19904T (Aquifer_n22) * Latitude: 8.760113 * Longitude: 104.997761 * Date/Time: 2021-03-23T00:00:00 * Elevation: 2.2 m * Location: Ca Mau * Campaign: (Groundwater Monitoring) * Basis: Sampling on land * Method/Device: Water pump (PUMP) * Comment: Groundwater monitoring well

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Steinel, Anke
2	Aquifer, location	Aquifer loc		Steinel, Anke
3	LATITUDE	Latitude		Steinel, Anke		Geocode
4	LONGITUDE	Longitude		Steinel, Anke		Geocode
5	DEPTH, sediment/rock	Depth sed	m	Steinel, Anke		Geocode – Calculated average/mean values of screen interval
6	Depth, top/min	Depth top	m	Steinel, Anke		Screen top
7	Depth, bottom/max	Depth bot	m	Steinel, Anke		Screen bottom
8	DATE/TIME	Date/Time		Steinel, Anke		Geocode – Date
9	Water level	WL	m	Steinel, Anke	Water level gauge, HT Hydrotechnik, Type 010-50m
10	Temperature, water	Temp	°C	Steinel, Anke	Conductivity meter, Hanna Instruments, HI8733	measured in the field
11	Conductivity, electrolytic	EC	µS/cm	Steinel, Anke	Conductivity meter, Hanna Instruments, HI8733	measured in the field
12	pH	pH		Steinel, Anke	pH-meter, WTW, Multi 3430, SenTix 41	measured in the field
13	Oxygen, dissolved	DO	mg/l	Steinel, Anke	Oxygen probe, WTW, Multi 3430, CellOx 325	measured in the field
14	Bicarbonate ion	[HCO3]-	mg/l	Steinel, Anke	Gran-plot titration; according to Rounds and Wilde (2012)	measured in the field
15	Sodium	Na+	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
16	Potassium	K+	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
17	Calcium	Ca2+	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
18	Magnesium	Mg2+	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
19	Chloride	Cl-	mg/l	Degtjarev, Anna	Ion chromatograph, Thermo Scientific, Dionex ICS-5000+
20	Sulfate	[SO4]2-	mg/l	Degtjarev, Anna	Ion chromatograph, Thermo Scientific, Dionex ICS-5000+
21	Bicarbonate ion	[HCO3]-	mg/l	Degtjarev, Anna	Titration system, Mettler-Toledo, Excellence T90	lab
22	Carbon, inorganic, dissolved	DIC	mg/l	Degtjarev, Anna	Calculated from measured pH and [HCO3]- values using PHREEQC
23	Carbon, organic, dissolved	DOC	mg/l	Osenbrück, Karsten	Infrared spectrometer, Elementar, vario-TOC
24	Ammonium	[NH4]+	mg/l	Degtjarev, Anna	UV-vis spectrometer, Thermo Scientific, Evolution 220
25	Nitrate	[NO3]-	mg/l	Viol, Mexwell	Ion chromatograph, Thermo Scientific, Dionex ICS-5000+
26	Aluminium	Al	mg/l	Degtjarev, Anna	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
27	Arsenic	As	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
28	Boron	B	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
29	Barium	Ba	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
30	Beryllium	Be	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
31	Bromine	Br	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
32	Cadmium	Cd	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
33	Cobalt	Co	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
34	Chromium	Cr	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
35	Copper	Cu	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
36	Fluorine	F	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
37	Iron	Fe	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
38	Lithium	Li	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
39	Manganese	Mn	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
40	Nickel	Ni	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
41	Phosphorus	P	mg/l	Degtjarev, Anna	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
42	Lead	Pb	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
43	Scandium	Sc	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
44	Silicon	Si	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
45	Strontium	Sr	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
46	Titanium	Ti	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
47	Vanadium	V	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
48	Zinc	Zn	mg/l	Fastert, Tanja	Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), Spectro Arcos
49	δ Deuterium	δD	‰ SMOW	Königer, Paul	Cavity ring-down spectroscopy (CRDS), Picarro, isotopic water analyzer L2120-i	vs VSMOW
50	δ Deuterium, standard deviation	δD std dev	±	Königer, Paul
51	δ18O, water	δ18O H2O	‰ SMOW	Königer, Paul	Cavity ring-down spectroscopy (CRDS), Picarro, isotopic water analyzer L2120-i	vs VSMOW
52	δ18O, water, standard deviation	δ18O H2O std dev	±	Königer, Paul
53	δ13C, dissolved inorganic carbon	δ13C DIC	‰ PDB	Dee, Michael W	Isotope ratio mass spectrometer, Elementar, IsoPrime 100 i	vs VPDB
54	δ13C, dissolved inorganic carbon, standard deviation	δ13C DIC std dev	±	Dee, Michael W
55	Carbon-14, modern, dissolved inorganic carbon	pMC DIC	%	Dee, Michael W	Accelerator mass spectrometry, Ionplus, Mini Carbon Dating System (MiCaDaS AWI)
56	Carbon-14, modern, dissolved inorganic carbon, standard deviation	pMC DIC std dev	±	Dee, Michael W
57	AGE	Age	ka BP	Osenbrück, Karsten	Calculated using radioactice decay law after adjustment of initial concentrations by mass balance modeling using PHREEQC	Geocode – 14C DIC age
58	Age, standard deviation	Age std dev	±	Osenbrück, Karsten		14C DIC age
59	Comment	Comment

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

6297 data points

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