[A-HW25] 都市域の地下水・環境地質

[AHW25-P02] 南ゴビ地域の地下水の水質分布

*中澤 暦¹、永淵 修¹、岡野 寛治¹、尾坂 兼一¹、浜端 悦治¹、池田 佳祐¹、吉田 明史¹、チョイル ジャブザン²、ツォグトバータル ジャムストラム² (1.滋賀県立大、2.モンゴル科学アカデミー)

39 ground water samples were collected from wells in August to September 2013 in South gobi, Mongolia. Sampling sites were located in Oyu tolgoi (Cu mine and Au mine), Tavan tolgoi (coal mine) which were large-mining activity has been conducted. In addition, samples are collected in northern area of Mongolia for comparison. PH, EC, the concentration of fluoride (F^?), chloride (Cl^?), sulfate (SO₄^2?), nitrate (NO₃^?), sodium (Na⁺), potassium (K⁺), calcium (Ca2+), magnesium (Mg2+), mercury (Hg), manganese (Mn), nickel (Ni), zinc (Zn), cadmium (Cd), lead (Pb), chromium (Cr), arsenic (As), selenium (Se), lithium (Li), aluminium (Al), vanadium (V), cobalt (Co), molybdenum (Mo), indium (In), antimony (Sb) and tellurium (Te) were measured. We charactrize the water quality and human helath risk. In Tavan tolgoi and Oyu tolgoi, HQ (Hazard Qoutient) showed > 1, which is considered at risk. In Oyu tolgoi, HQ of NO3- (29.6+-20.1 mg/l) and As (6.63+-5.69ug/l) showed > 1. In Tavan tolgoi, HQ of NO3- (47.1+-36.2 mg/l) showed > 1 and it contribute the most (44 %) to the average HI, followed by As (17 %, 2.57+-3.72ug/l) and Mo (17 %, 17.8 +-11.1ug/l). On the other hand neither HQ nor HI not showed > 1 in Northern area. Result from the nitrogen and oxygen stable isotope ratio, NO3- contamination in Oyu tolgoi and Tavan tolgoi was caused from livestock waste.