A SURVEY OF DIETARY NITRATE IN WELL-WATER USERS
A SURVEY OF DIETARY NITRATE IN WELL-WATER USERS
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DOI：
10.1093/ije/13.3.324
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发表时间：
1984-01-01
影响因子：
7.7
通讯作者：
HILL, M
中科院分区：
文献类型：
--
作者：
CHILVERS, C;INSKIP, H;HILL, M
高硝酸盐摄入量可能会增加胃癌风险的假设引起了人们对饮用水中硝酸盐含量上升的担忧，但很少考虑水中的硝酸盐是否对硝酸盐总摄入量做出了主要贡献。为了调查水和食物作为硝酸盐来源的相对重要性，404 名成年井水使用者在 48 小时内完成了饮食日记，并提供了 24 小时尿液样本和饮用水样本。 根据世界卫生组织的建议，当水中硝酸盐含量<50毫克/升时，摄入的硝酸盐中有30%来自于水。随着井水硝酸盐浓度的升高，水对每日摄入量的贡献也随之增加；平均而言，浓度在 540 至 100 毫克/升之间时，近 70% 的每日摄入量来自于水，而 > 100 毫克/升时，超过 80% 的每日摄入量来自于水。只有当水性硝酸盐的水平高于世界卫生组织目前推荐的水平时，水性硝酸盐才可能成为硝酸盐总摄入量的主要贡献者。
The hypothesis that high nitrate ingestion may increase the risk of stomach cancer has led to concern over rising levels of nitrate in drinking water, but with little consideration as to whether nitrate from water makes a major contribution to total nitrate intake. In order to investigate the relative importance of water and food as sources of nitrate, 404 adult well-water users completed a diet diary over a 48-h period and provided a 24-h urine specimen and a sample of their drinking water. Where the waterborne nitrate level is < 50 mg/l, as recommended by WHO, 30% of ingested nitrate is from water. As the well-water nitrate concentration rises the contribution of water to daily intake increases; at levels between 540 and 100 mg/l, on average, nearly 70% of daily intake is from water, and > 100 mg/l over 80% of daily intake is waterborne. It is only at levels above those currently recommended by the WHO that waterborne nitrate appears to be the major contributor to total nitrate intake.