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砷的测定甘蔗土壤和叶片组织从市政厅,劳拉,委内瑞拉氢化物发生原子吸收光谱

作者(年代):Maria De洛杉矶Yepez马科斯雷纳,弗朗西斯Segura Jorge Amaya耶稣阿罗约,Beatriz Arrieche,赛达Matute, Lue-Meru马可·P

总砷含量测定甘蔗土壤和作物的叶面组织市政厅Palavecino,劳拉,委内瑞拉用氢化物发生原子吸收光谱法的方法。样本取自六的农场区。在制备过程优化的KI和HCl被添加到土壤泥浆为了执行预先消化和预还原的砷。湿法消化后叶面组织样本进行了分析过程在一个类似的过程对土壤pre-reduction一步。硼氢化钠3%氢氧化钠1%后添加到产生胂。氩气流量是用于运输胂的石英细胞分光计。测量进行了珀金埃尔默3110光谱仪氢化物生成模块。土壤中的砷含量在5.75至12.13的范围我g / g,精度验证了分析NIST标准参考资料圣华金土壤和布法罗河沉积物。叶面组织样品中的砷含量在0.24至0.29的范围我g / g。NIST的准确性验证标准参考资料1573番茄叶子。 The proposed soil slurry preparation method avoids the possible losses of the traditional digestion procedures with adequate analytical quality. A good agreement was found between the certified values and those obtained with the proposed procedure. The arsenic levels in the soils are lower than the average toxicity threshold value for crop plants. Eventhough the sampled sites are under risk of contamination due to the intensive use of pesticides containing this toxic element. The Arsenic levels in the foliar tissue indicate absorption and transport of this toxic element and the necessity of further studies for the evaluation of the associated risk. Nevertheless, the arsenic concentration in foliar tissue is significantly lower than those values found in risk zones.