This paper aims to evaluate ecological benefits of maize harmful and beneficial elements in Hetao agricultural economic zone. Maize rhizosphere soil,seed,stem and leaf samples are collected from Hetao agricultural eco...This paper aims to evaluate ecological benefits of maize harmful and beneficial elements in Hetao agricultural economic zone. Maize rhizosphere soil,seed,stem and leaf samples are collected from Hetao agricultural economic zone in Inner Mongolia,and the content of poisonous,harmful and beneficial elements is analyzed. The main harmful elements account for a small proportion in maize seeds and stems,and most of them are at low enrichment level; most of the beneficial elements are at low enrichment level,and only N is at high enrichment level.The content of As,Pb,Cd,Hg,Cr,Cu and As in maize rhizosphere soil is lower than the national standard,in line with the green standard,and the environment conditions of producing area are excellent. Maize in the study area is pollution-free food,which can be used as sustenance for human and animal.展开更多
Tl is a dispersed element and it seldom occurs in the form of independent minerals. The world annual production of Tl is about 13 ton, most of which is by-product separated from non-ferrous metal products. Lanmuchang ...Tl is a dispersed element and it seldom occurs in the form of independent minerals. The world annual production of Tl is about 13 ton, most of which is by-product separated from non-ferrous metal products. Lanmuchang is the only large-size independent Tl deposit in the world. Bio-enrichment and hydrothermal reworking are the two important metallogenic mechanisms of this Tl deposit. Samples of plant and animal organs and villagers’ urine as well as hair and nail (toenail) samples from the Tl mining district were analyzed. Analytical results showed that the contents of Tl, Hg and As are high, suggesting that the residents and villagers in the mining district have been affected by Ti-Hg pollution, and on the other hand, they can serve as the guidelines for ore prospecting. The contents of Tl, Hg, and As in human beings and other organic bodies depend largely on the background values of these metals in rock, ore, soil and water.展开更多
基金Supported by Ecological Geochemical Investigation in Hetao Agricultural Economic Zone(200414200005)
文摘This paper aims to evaluate ecological benefits of maize harmful and beneficial elements in Hetao agricultural economic zone. Maize rhizosphere soil,seed,stem and leaf samples are collected from Hetao agricultural economic zone in Inner Mongolia,and the content of poisonous,harmful and beneficial elements is analyzed. The main harmful elements account for a small proportion in maize seeds and stems,and most of them are at low enrichment level; most of the beneficial elements are at low enrichment level,and only N is at high enrichment level.The content of As,Pb,Cd,Hg,Cr,Cu and As in maize rhizosphere soil is lower than the national standard,in line with the green standard,and the environment conditions of producing area are excellent. Maize in the study area is pollution-free food,which can be used as sustenance for human and animal.
文摘Tl is a dispersed element and it seldom occurs in the form of independent minerals. The world annual production of Tl is about 13 ton, most of which is by-product separated from non-ferrous metal products. Lanmuchang is the only large-size independent Tl deposit in the world. Bio-enrichment and hydrothermal reworking are the two important metallogenic mechanisms of this Tl deposit. Samples of plant and animal organs and villagers’ urine as well as hair and nail (toenail) samples from the Tl mining district were analyzed. Analytical results showed that the contents of Tl, Hg and As are high, suggesting that the residents and villagers in the mining district have been affected by Ti-Hg pollution, and on the other hand, they can serve as the guidelines for ore prospecting. The contents of Tl, Hg, and As in human beings and other organic bodies depend largely on the background values of these metals in rock, ore, soil and water.
