การสะสมสารหนูของพืชล้มลุกชนิดเด่นที่พบในบริเวณเหมืองแร่ทองคำ
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Abstract
Arsenic (As) is one of the most deadly, poisonous chemical elements, commonly found as a contaminant in soils or water from mining or pesticides used in agricultural activities. The arsenic poisoning affects ecosystem and health of million people, especially those who live around the risky area such as gold mines. Thus, the use of local plants, especially arsenic hyperaccumulators, to remove or reduce As contamination from environment is considered a low cost, sustainable and environmental-friendly cleanup strategy. Our project therefore aims to study the potential in As uptake of dominant herbaceous plants growing around gold mine areas of Tap Khlo district in Pichit province. The underground parts (roots) and overground parts (shoots) of 11 species of dominant herbaceous plants, including the soils in the area where they grow, were collected and examined the arsenic content by ICP-MS (inductively coupled plasma mass spectrometry). Plants were classified by determining their translocation factor (TF), bioaccumulation factor (BAF) and bioconcentration factor (BCF). The results of soil analysis showed that As exceeded the standard level allowed to be found in soil, in every sampling point. None of the plant species could be classified as arsenic hyperaccumulator. Seven species i.e. Ruellia tuberosa L., Stylosanthes humilis Kunth., Hyptis suaveolens (L.) Poit, Sida acuta Burm.f., Pennisetum polystachyon (L.) Schult., Leptochloa chinensis Nees and Sorghum helepense Press., were classified as arsenic excluder. Although the arsenic hyperaccumulator could not be found in our study, the results will raise people’s awareness of the high As contamination in soils around this gold mine area. Body of knowledge from our research will also pave the way for future observation and comprehensive studies on plants that are potentially arsenic hyperaccumulators.
Keywords: arsenic; herbaceous plant; gold mine
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References
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[35] กำธน สินธวานนท์, 2533, พืชอาหารสัตว์ : พันธุ์พืชอาหารสัตว์จากต่างประเทศ, สารานุกรมไทยสำหรับเยาวชน เล่มที่ 14, โครงการสารานุกรมไทยสำหรับเยาวชน โดยพระราชประสงค์ในพระบาทสมเด็จพระเจ้าอยู่หัว, กรุงเทพฯ.