First water sampling campaign in U Minh

BGR and NAWAPI agreed to conduct several studies on the hydrogeological characteristics of Ca Mau province, which is commonly considered as one of the regions most severely affected by climate change and sea level rise. To date, a cluster of 5 wells has been completely constructed in U Minh town, U Minh District, Ca Mau Province which consists of one pumping and two monitoring wells in the n22 aquifer, one monitoring well in the qp1, and one monitoring well in the qp2–3 aquifer.

On 28 and 29 September, 2016, the IGPVN Project has conducted a first water sampling in U Minh town. Groundwater samples were taken from three IGPVN monitoring wells in the n22, qp1 and qp2–3 aquifers; one production well for water supply in U Minh town in the qp1 aquifer; and one production well of a bottled water factory in the n22 aquifer. Two surface water samples were also collected at the U Minh river and Cai Tau canal.

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Installing MP1 pump at the IGPVN monitoring well in U Minh

Water levels, pumping rates and the chemical and physical parameters (pH, electrical conductivity, dissolved oxygen, temperature) were measured and recorded on site.

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Measuring water level in the IGPVN monitoring well in U Minh

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On-site measuring physico-chemical parameters of groundwater

Water was pumped from the monitoring wells until stagnant water from the well pipe had been removed (purging) and the physical and chemical parameters were constant. Water from the production wells could be taken from a sampling tap. Right after sampling, the water samples were titrated with HCl and NaOH for the determination of the carbonate species (HCO3, H2CO3).

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Titrating water sample with HCl and NaOH standard solutions

Further details on this sampling campaign can be found here.

The water samples have been sent to external laboratories to determine the major ion components (Na+, K+, Mg2+, Ca2+, Cl, HCO3, SO42−)  and other parameters indicated in the national technical standards for the surface water quality and groundwater quality. In addition, stable isotope compositions (2H, 18O) of the water samples will also be analyzed and evaluated. These analyses will be performed by the Center of Analytical Services and Experimentation in Ho Chi Minh City and the Institute for Nuclear Science and Technology, respectively.

After the laboratory results are available, they will be examined to increase the understanding of groundwater chemistry and possible interaction between aquifers in the area.

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