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首页> 外文会议>Second International Conference on Sustainable Agriculture for Food, Energy and Industry Vol.2 >Sustainable Production of Vegetables on Ex-mining Land in Peninsular Malaysia: Heavy metals perspective
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Sustainable Production of Vegetables on Ex-mining Land in Peninsular Malaysia: Heavy metals perspective

机译：重金属视角下马来西亚半岛矿山上蔬菜的可持续生产

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The heavy metal content in agricultural soils is one of the indicators of soil quality and has been used by many countries. Heavy metals in soils may be taken by leafy and root vegetables. Due to shortage of land in sub-urban areas for vegetable production, large tracts of ex-mining land have been cultivated with fruit trees and vegetables. The major practice for soil amendment of this sandy material is by incorporation of high amount (40 t/ha) of chicken manure. These lands have been cultivated for more than 20 years. Our concern on the sustainability in terms of heavy metal accumulation led us to a study the concentration of heavy metals in these ex-mining soils and also the content in the vegetables, especially the root crops such as sweet potato, yam bean, tapioca and radish which are popularly grown. A total of 180 soil samples (0-20 cm, 20-40 cm and 40-60 cm) from vegetable plots were collected. For background levels of heavy metals, uncultivated soils were also sampled. The soils were air dried, and analyzed for the following properties: pH, total organic carbon, and heavy metal content (Cd, Pb, Cu, Zn and Ni) by aqua regia extraction. Sweet potato, yam bean and tapioca were collected from the soil-sampling sites. They were washed with distilled water, cut with stainless steel knife and weighed. They are then placed in brown paper bags and left to dry at 65℃ in the oven. After drying, the heavy metals were extracted through dry ashing of the tissues and taken into a solution of 1% nitric acid. The heavy metals (Cd, Pb Cu, Zn and Ni) were determined by Atomic Absorption Spectrophotometry. Use of chicken manure in the cultivation of vegetables on sandy tailings has increased the pH, organic matter content and total Pb, Zn, Ni and Cu contents. However, in general, the mean total heavy metals (Pb, Ni, Zn, Cd and Cu) in the soils are all within the normal range of other agricultural soils in the country and also of the uncultivated areas. The range of concentrations for Zn (3.5-5.6 mg/kg), Cu (0.28-0.90 mg/kg), Pb (0.21-0.56 mg/kg), Ni (0.24-0.87 mg/kg) and Cd (0.03-0.13 mg/kg) in the sweet potato, yam bean and tapioca grown on the ex-mining land, are all below the maximum permitted concentrations (MPC) as gazetted under the Malaysia Food Act 1983 and Food Regulation 1985. However, monitoring of these values should still be carried out to ensure that vegetables grown on ex-mining land are safe for consumption.
机译：农业土壤中的重金属含量是土壤质量的指标之一，已被许多国家使用。叶菜类和块根类蔬菜可能吸收土壤中的重金属。由于郊区地区用于蔬菜生产的土地短缺，大量的采掘土地上种植了果树和蔬菜。对该砂质材料进行土壤改良的主要做法是掺入大量（40吨/公顷）鸡粪。这些土地已经耕种了20多年。我们对重金属积累的可持续性的关注使我们开展了一项研究，研究这些新兴土壤中重金属的浓度以及蔬菜中的含量，尤其是诸如甘薯，山药豆，木薯和萝卜等块根作物普遍种植。总共从蔬菜地收集了180个土壤样品（0-20厘米，20-40厘米和40-60厘米）。对于重金属的背景水平，还对未耕种的土壤进行了采样。将土壤风干，并通过王水萃取分析以下性质：pH，总有机碳和重金属含量（Cd，Pb，Cu，Zn和Ni）。从土壤采样点收集了甘薯，山药豆和木薯粉。将它们用蒸馏水洗涤，用不锈钢刀切下并称重。然后将它们放在牛皮纸袋中，并在烤箱中于65℃下干燥。干燥后，通过对组织进行干灰化来提取重金属，并将其放入1％的硝酸溶液中。重金属（镉，铅，铜，锌和镍）通过原子吸收分光光度法测定。鸡粪在沙质尾矿上的蔬菜栽培中使用增加了pH值，有机质含量以及总Pb，Zn，Ni和Cu含量。但是，一般而言，土壤中的平均总重金属（Pb，Ni，Zn，Cd和Cu）都在该国其他农业土壤以及未耕地的正常范围内。锌（3.5-5.6 mg / kg），铜（0.28-0.90 mg / kg），铅（0.21-0.56 mg / kg），镍（0.24-0.87 mg / kg）和镉（0.03-0.13）的浓度范围开采地上种植的甘薯，山药豆和木薯淀粉中的所有含量均未超过《 1983年马来西亚食品法》和《 1985年食品法规》所公布的最大允许浓度（MPC）。但是，监测这些值仍应进行以确保在开采前的土地上种植的蔬菜可以安全食用。

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