一九七八年以来,对食管癌高发区涉县水环境中亚硝胺前体—硝酸盐与亚硝酸盐进行了测定,结果表明二者含量均较高。同时发现食管癌高、低发点之间硝酸盐与亚硝酸盐的含量均有显著性差异,并呈正相关关系。为了进一步对食管癌病因进行探讨,对地水环境中挥发 Since 1978, nitrates and nitrites of nitrosamines precursors in the water environment of high-risk areas of esophageal cancer have been measured. The results showed that the contents of both are high. At the same time, it was found that there were significant differences in the contents of nitrate and nitrite between high and low eruption points of esophageal cancer, and there was a positive correlation. To further explore the causes of esophageal cancer, volatilize in the water environment