Kahayan river survey for mercury pollutant by gold mining in Kalimantan, Indonesia

印度尼西亚加里曼丹金矿开采的卡哈扬河汞污染物调查

• 批准号: 17404011
• 负责人: INOUE Takanobu
• 金额: $ 5.06万
• 依托单位: Toyohashi University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17404011/
• 关键词: Mercury; gold mining; water pollutant; toxicity

Gold mining activities have recently increased in the catchment of the Kahayan River in Central Kalimantan. Water contamination with mercury (Hg) due to the mining activities has been of concern to the residents along the Kahayan as well as those who live in Palangka Raya, which is the capital town of Central Kalimantan. In this study, the survey on Hg contamination in river water and sediment in the Kahayan and the major tributary, the Rungan River, were conducted to make clear the recent contamination level of river water and sediment.The surveys were carried out between Palangka Raya and Tubangmiri which is the town located about 100km up the stream in the Kahayan River and between the confluence point with the Kahayan and Mungukubaru located about 50km up the stream in the Rungan River, including the survey on the water in some tributary of the rivers.The total Hg concentrations in water in the main stream of the rivers were below 200 ng/L, and those were lower than 1000 ng/L, which is the standard values in Indonesia. Higher concentrations of Hg in some tributaries than those in the main stream were observed in both the Kahayan and the Rungan.The Hg contents in sediment were below 0.5 mg-Hg/kg-Dry Weight. The contents in sediment in this area were so far in a relatively low Hg contamination level comparing other gold mining areas. The Hg contents in fish were 0.02-0.5 mg・Hg/kg-Wet Weight, and Mystus was higher than other species.Continuous observation of the Hg concentration in water and sediment in the river is necessary to know the impact of gold mining activity on the contamination of Hg in the rivers as well as to predict the situation of Hg contamination in the watershed in the future.

加里曼丹中部Kahayan河流域的金矿开采活动最近有所增加。采矿活动造成的水汞污染一直是卡哈扬河沿着居民以及加里曼丹中部首府帕朗卡拉亚居民关注的问题。本研究对卡哈延河及其主要支流润干河河水和沉积物中汞污染状况进行了调查，调查在Palangka Raya和Tubangmiri之间进行，Tubangmiri是位于Kahayan河上游约100公里处的城镇，以及位于Kahayan河与Mungukubaru汇合点之间，在润干河上游50 km处进行了调查，包括对河流部分支流的调查，结果表明，河流干流水体中总汞浓度均在200 ng/L以下，低于印尼标准值1000 ng/L。Kahayan河和Rungan河部分支流的Hg含量高于干流，沉积物中Hg含量低于0. 5 mg-Hg/kg干重。与其他金矿区相比，该地区沉积物中汞含量目前处于较低的污染水平。汞在鱼类中的含量为0.02- 0.5mg·Hg/kg-Wet We