Measurement of 222Rn Concentrations in Surface Water in Northeast Thailand

Hamada, Hiromasa; Sukchan, Somsak; Putiso, Mahithon

doi:10.3769/radioisotopes.54.315

Cited by 2 publications

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“…Higher radon concentration during the post-storm event could be the result of increased groundwater influx from the shallow aquifer into the river basin [34]. Rapid increase of groundwater table during the storm period could increase the hydrostatic pressure thus increase the lateral groundwater discharge into adjacent river [31,32]. Level of radon recorded during post-storm was at least one magnitude higher compared to the dry period, indicates high portion of groundwater contributing to storm flow generated in Ular River.…”

Section: Resultsmentioning

confidence: 99%

Quantification of Groundwater-Derived Nutrients Into Beach Ridge Drainage Using Radon Mass Balance Model

2018

MJAS

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Groundwater discharge can be a significant pathway for dissolved nutrients to surface water and thus can bring forth important implications to the coastal biogeochemical cycles. Discrete sampling of radon concentrations at several locations along an interridge drainage off Setiu Wetlands were carried out to estimate the fluxes of groundwater discharge. The 222 Rn mass balance results show that groundwater discharge in the drainage is estimated to be 6649 m 3 day -1 , made up of ~33% of total water discharge and has contributed 2.88×10 2 molday -1 , 1.23×10 2 molday -1 and 0.75molday -1 of ammonium-nitrogen, nitrate-nitrogen and nitrite-nitrogen, respectively into the surface water drainage. Strong correlation between radon and ammonium suggested that the source of nutrient in drainage is groundwater-based, derived probably from the nearby damaged or leaking residential septic tanks and from agricultural practices of oil palm plantation.Keywords: groundwater-surface water interaction, water quality, beach ridge drainage, Setiu, Malaysia Abstrak Pelepasan air bawah tanah merupakan satu laluan penting untuk nutrien ke air permukaan. Proses ini mampu membawa implikasi yang penting terhadap kitaran biogeokimia di pesisiran pantai. Pensampelan radon di sepanjang saluran pematang pasir telah dijalankan untuk menentukan kadar pelepasan air bawah tanah. Hasil model keseimbangan jisim 222 Rn telah menunjukkan kadar pelepasan air bawah tanah di saluran adalah sebanyak 6649 m 3 hari -1 dan nilai ini merangkumi ~33% daripada jumlah pelepasan air. Pelepasan air bawah tanah juga menyumbang sebanyak 2.88×10 2 mol hari -1 amonium-nitrogen, 1.23×10 2 mol hari -1 nitrit-nitrogen dan 0.75 mol hari -1 dan nitrit-nitrogen ke air permukaan saluran. Kolerasi antara kepekatan radon dan ammonium di saluran juga mencadangkan sumber nutrien berasal dari air bawah tanah yang kemungkinan tercemar oleh sisa pembuangan kumbahan dari kawasan kediaman berdekatan dan rembesan pertanian dari ladang kelapa sawit di sekitarnya.Kata kunci: interaksi air bawah tanah-air permukaan, kualiti air, saluran pematang pasir, Setiu, Malaysia

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Section: Resultsmentioning

confidence: 99%

Quantification of Groundwater-Derived Nutrients Into Beach Ridge Drainage Using Radon Mass Balance Model

2018

MJAS

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“…It has previously been reported that the 222 Rn concentration at location 3, which is a small stream, was higher in the rainy season than in the dry season because of greater subsurface flow in the rainy season 8 . However, the 222 Rn concentration (Table 1) and the electric conductivity (Table 2) at the end of August (August 29-31) were very low, at 11 mBq/L and 51 µS/cm respectively.…”

Section: Influence Of Human Activity On 222 Rn Concentration In Surfamentioning

confidence: 99%

Monitoring of Radon-222 Concentration in Surface Waters of the Ban Phai Subwatershed Northeast Thailand Using a Method to Concentrate Radon by Air-circulation

Hamada

Sukchan²

2008

JARQ

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Radon-222 ( 222 Rn) concentration in surface water is a useful indicator for groundwater seepage. However, the natural concentration of 222 Rn in surface water is too low to measure. It is therefore necessary to concentrate 222 Rn content in water samples before analysis. This is a difficult operation requiring specialized equipment. We developed a method of measurement of 222 Rn concentration in surface water (a method to concentrate radon by air-circulation) and applied it to detect groundwater seepage in the Ban Phai subwatershed, northeast Thailand. We also measured electric conductivity to determine whether dissolved ions in water were brought by groundwater. In areas of high-elevation (>180 m above sea level), 222 Rn concentration in surface water was low, indicating that the velocity of subsurface water flow was slow even in the rainy season. This result supported a flow velocity previously calculated from the permeability of surface soil and the hydraulic gradient. Our measurements of 222 Rn concentrations revealed that groundwater can be obtained by digging to a depth of about 1 m in the river bed in some areas. In areas of low-elevation (<160 m above sea level), electric conductivity increased markedly in the dry season. This was attributed to evaporation, rather than the effect of groundwater seepage, because the 222 Rn concentration was low, suggesting little influence of groundwater.

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Measurement of 222Rn Concentrations in Surface Water in Northeast Thailand

Cited by 2 publications

References 0 publications

Quantification of Groundwater-Derived Nutrients Into Beach Ridge Drainage Using Radon Mass Balance Model

Quantification of Groundwater-Derived Nutrients Into Beach Ridge Drainage Using Radon Mass Balance Model

Monitoring of Radon-222 Concentration in Surface Waters of the Ban Phai Subwatershed Northeast Thailand Using a Method to Concentrate Radon by Air-circulation

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