Contamination of heavy metals in rice from organic paddy field | การปนเปื้อนโลหะหนักในข้าวจากแปลงปลูกข้าวอินทรีย์
2009
Nanthana Cheun-im(Kasetsart University, Bangkok (Thailand). Kasetsart University Research and Development Institute. Scientific Equipment Center) | Nusara Sinbuathong(Kasetsart University, Bangkok (Thailand). Kasetsart University Research and Development Institute. Scientific Equipment Center) | Wiwat Ingkapradit(Department of Agriculture, Bangkok (Thailand). Research and Development Office) | Vasana Inklang(Department of Agriculture, Bangkok (Thailand). Research and Development Office) | Vithasanti Hom-ngarm(The Chaipattana Foundation, Bangkok (Thailand). Agricultural Service Center, The Chaipattana Foundation, Pathum Thani)
Concentrations of cadmium (Cd), chromium (Cr), lead (Pb), copper (Cu), nickel (Ni), zinc (Zn), and iron (Fe) in rice from organic paddy field at Pathumthani Rice Research Center (PRRC) and Agricultural Service Center (ASC), Pathumthani Province where there was no indication of industrial effects were investigated. Cow manures were applied at PRRC and ASC with the rate of 500 and 1,300 kg/rai respectively. Rice plants at harvest from PRRC and ASC sites were sampled and separated into the part of stem, seed and husk. The samples were digested by acid mixture (HNO3/HClO4) and then determined by atomic absorption spectrophotometry. The results showed that there were no Cd Pb และ Ni in seeds. The other heavy metals that found in seed, stem and husk was much lower than the critical level in plants. This indicated that the level of heavy metals in the part of seed, stem and husk were acceptable and that of seed was much lower contaminated than the stem and husk.
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