Abstract:
Objective To compare the contents of environmental chemical elements in soil, drinking water, and rice in areas with high and low mortalities of gastric cancer in Xianyou County, and describe the distribution of the elements.
Methods Representative towns with high (7 towns) or low (5 towns) mortalities of gastric cancer were randomly selected in Xianyou County. Samples of soil (n=99), drinking water (n=99), and rice (n=53) were collected from 2-3 villages of each town. Atomic fluorescence spectrometry was used to determine selenium (Se), arsenic (As), and mercury (Hg) in each sample. Inductively coupled plasma mass spectrometry was used to determine calcium (Ca), iron (Fe), magnesium (Mg), manganese (Mn), cobalt (Co), nickle (Ni), copper (Cu), zinc (Zn), molybdenum (Mo), cadmium (Cd), barium (Ba), and lead (Pb) in each sample. Statistical analysis was performed to analyze the difference and significance of the contents of chemical elements in soil, drinking water, and rice samples between areas with high and low mortalities of gastric cancer.
Results The median contents of Ca and Mg in the soil samples collected in high-mortality areas were lower than those in the low -mortality area (P < 0.05). Se and As in drinking water were not detected. The median mass concentrations of Ca, Mg, Mn, Co, Ni, Ba, and Pb in drinking water samples collected in high-mortality areas were lower than those in the low-mortality areas (P < 0.05). The median content of Mo and the ratio of zinc to copper in rice samples collected in high-mortality areas were lower than those in the low-mortality areas, whereas the median Mg and Mn contents were higher (P < 0.05).
Conclusion In areas with high and low mortalities of gastric cancer in Xianyou County, such elements as Ca and Mg are different in soil, drinking water and rice.
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