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南京医科大学Science Advances|中国大米镉含量标准的健康风险评估

  • 2026-03-28 01:40:10
南京医科大学Science Advances|中国大米镉含量标准的健康风险评估

随着对镉暴露水平及其毒性机制认识的深入,现行大米镉限量标准是否足以保护公众健康亟需重新评估。本研究系统分析了江苏省环境介质(空气、土壤、大米)及人群生物样本(血、尿)中的镉含量,结合文献数据,采用基准剂量法和生理毒代动力学模型,评估了膳食镉暴露的健康风险,并推导了基于健康保护的膳食镉参考值及大米镉安全阈值。结果显示,39.04% 的大米样品膳食镉摄入量超过与慢性肾脏病相关的基准剂量下限(17.100 μg/天);超过 90% 的米样存在潜在非致癌风险,部分样品具有终身致癌风险。血镉和尿镉水平呈现年龄依赖性增加,分别有 48.40% 和 20.61% 的参与者超过相应的基准剂量下限(血镉 0.640 μg/L,尿镉 0.120 μg/L)。推导出的成人膳食镉参考值为 0.149 μg/kg体重/天,儿童为 0.018 μg/kg体重/天;相应的大米镉安全阈值成人仅为 0.017 mg/kg,儿童为 0.0006 mg/kg,远低于现行国家标准(0.2 mg/kg)。研究表明当前标准对公众健康保护不足,亟需制定更严格的限量值。

1 科学问题

现行中国大米镉限量标准(GB 2762-2022,0.2 mg/kg)主要参考国际指南制定,但面对快速经济发展、膳食结构改变及人群代谢差异,该标准能否有效降低镉相关疾病风险、保护包括儿童在内的敏感人群?尤其在中国以大米为主食的地区,需要从外暴露(环境)和内暴露(生物监测)两个维度综合评估现有标准的适宜性,并建立符合中国人群特征的卫生指导值。

2 研究方案

样品采集:2022年在江苏省多个城市采集环境样品(空气PM2.5 1273份、土壤520份、大米520份)和人群生物样本(血626份、尿626份)。同时,在5个县设立40个采样点,系统采集土壤、稻根、稻茎和稻谷样品,分析镉含量。

暴露评估:计算土壤-水稻系统的生物富集因子;用地累积指数评价土壤镉污染程度;估算大米镉的每日摄入量,并根据大米镉占膳食镉比例(55.8%)推算总膳食镉摄入量。

健康风险评估:采用危害商数和终身致癌风险模型评估不同年龄段(儿童、青少年、成人)的非致癌和致癌风险。参考剂量为1 μg/kg体重/天,致癌斜率因子为0.38 mg/kg/天。

基准剂量推导:系统检索2000—2024年间中国人群镉暴露与慢性肾脏病关系的文献,筛选出符合标准的研究,利用在线平台计算膳食镉、血镉、尿镉的基准剂量下限(BMDL5)。

生理毒代动力学模型:应用Kjellstrom-Nordberg修正模型,模拟不同性别、年龄人群经口摄入镉后在肾脏、肾皮质、血液和尿液中的累积浓度,并根据实测血镉反推每日膳食镉摄入量及大米镉安全浓度。

3 结论

主要发现

土壤镉含量均值0.203 mg/kg,水稻各部位(根、茎、籽粒)镉含量依次降低,但生物富集因子显示根系对镉的富集能力最强(72.5%样品BCF>1)。

大米镉含量均值0.046 mg/kg,虽低于国家限值,但健康风险评估表明:对儿童、青少年和成人分别有54.81%、28.46%和9.23%的样品存在潜在致癌风险;非致癌风险在各年龄段普遍存在。

人群血镉和尿镉水平随年龄增长而升高,女性内暴露水平高于男性。血镉超过ATSDR推荐安全水平(0.38 μg/L)的有210人(33.5%),但尿镉均低于联合国粮农组织/世界卫生组织食品添加剂联合专家委员会(JECFA)限值。

通过PBPK模型反推,为保护95%人群,成人每日膳食镉摄入应低于0.149 μg/kg体重,儿童应低于0.018 μg/kg体重;相应大米镉限量成人应为0.017 mg/kg,儿童仅为0.0006 mg/kg,远低于现行标准0.2 mg/kg。

不足与展望

横断面设计无法直接建立内暴露与健康结局的因果关系,未来需结合队列研究及更敏感的早期肾损伤标志物(如肾损伤分子-1等)。

缺乏个体大米消费量数据,未能精确解析大米镉贡献率;后续应开展膳食调查以细化暴露评估。

未考虑不同水稻品种对镉吸收的基因型差异,后续可结合转录组或代谢组分析。

缺乏吸烟信息,无法分别评估吸烟与非吸烟人群的健康风险。

β2-微球蛋白作为肾损伤标志物特异性有限,建议探索新型生物标志物。

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  1. CONNECT:[ UseTime:0.000415s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000572s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001963s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000280s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000495s ]
  6. SELECT * FROM `set` [ RunTime:0.000321s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000648s ]
  8. SELECT * FROM `article` WHERE `id` = 489600 LIMIT 1 [ RunTime:0.002507s ]
  9. UPDATE `article` SET `lasttime` = 1775347272 WHERE `id` = 489600 [ RunTime:0.000934s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000221s ]
  11. SELECT * FROM `article` WHERE `id` < 489600 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000420s ]
  12. SELECT * FROM `article` WHERE `id` > 489600 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000362s ]
  13. SELECT * FROM `article` WHERE `id` < 489600 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001944s ]
  14. SELECT * FROM `article` WHERE `id` < 489600 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000604s ]
  15. SELECT * FROM `article` WHERE `id` < 489600 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001160s ]
0.106648s