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Impact of the coal mining-contaminated soil on the food safety in Shaanxi, China

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Abstract

The study aimed to investigate the impacts of coal mining-contaminated soil on the locally grown food crops and humans health. For the active investigation and assessment, the study collected 175 samples including contaminated and control soil and various types of food crops (corn, wheat, mixed food (egg, pork meat, potato, pepper)) from Shaanxi Province. All these samples were analyzed through ICP-MS and ICP-OES. Results show that in Weibei soil, the average concentration (mg kg−1) of Cr (194 ± 94), Cu (27 ± 13), Cd (0.6 ± 0.3), Ni (83 ± 35), Be (1.98 ± 0.8), Rb (115 ± 68), Li (74 ± 78), Sr (148.5 ± 67), and Zn (3056 ± 2380) was higher than that of the Chinese soil standard (CSS) and upper continental crust (UCC) (P < 0.01–0.05). In Langao soil, the average concentration (mg kg−1) of Cr (99.5 ± 48), Cu (77 ± 32), Ni (113 ± 37), Pb (45 ± 19.8), Cd (2.9 ± 1.7), Co (13.9 ± 2.4), Mo (28.7 ± 16), Be (2.98 ± 0.5), Li (81.8 ± 9.7), V (430 ± 166), Zn (255 ± 105), and Ba (1347 ± 445) was higher than that of the CSS and UCC. However, in Binxian Jurassic all the toxic trace elements (TTE) were higher than the CSS and UCC. In Langao contaminated vegetable, Na, Cd, Tl, In, Mo, Li, U, Bi, and Th may cause very high risk, whereas Al, Mn, P, Fe, Ca, Cr, Ni, Pb, Co, Cs, Rb, and Ba may cause considerable risk. However, the average daily intake (ADI) of Al, Mn, P, Fe, Cd, Mo, and Ba was higher than the No Observable Adverse Effect Level (NOAEL). However, the non-carcinogenic risk of Al, Mn, P, Fe, Cr, Cu, Ni, Pb, Cd, Co, Tl, Mo, Li, V, Ba, and Th was higher than acceptable level (HQ = 1). In Binxian wheat, Al, Tl, Cs, Bi, and Th may cause very high risk, and Ti, Na, K, Fe, Ca, Cr, Ni, Cd, Pb, Sr, Bi, and U may cause considerable risk. However, ADI of Al, Mn, P, Ti, Fe, Cu, Ni, Pb, Mo, Ba, and U for both adults and children was higher than the NOAEL. In Weibei, the wheat crops are prone to considerable-to-moderate elemental risk. The non-carcinogenic risk of Al, Mn, P, Fe, Cr, Cu, Pb, Co, Tl, Mo, Li, Zn, and Th was higher than the acceptable level. In countryside adults and children, ADI was lower than the NOAEL except Al, P, and Zn. The study concluded that human activities of coal mining release a high amount of TTE to the soil. Majority of arable land, grain food and vegetable were contaminated through TTE, which may cause high risks to human’s health and the environment.

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Modified from Hussain and Luo (2018b)

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Acknowledgements

The National Natural Sciences Foundation (Grant Nos. 41877299, 41472322 and 41371449); The National Basic Research Program of China (Grant No. 2014CB238906), Science and Technology major project of Guangxi (Grant No. AA17202026-1) and CAS-TWAS Ph.D. fellowship (First author) supported this study. The authors are also grateful to Dr. Zhao Chao and Dr. Du Yajun for their ending cooperation during fieldwork and data analysis. Authors are grateful to Mr. Gao Bolin and local residents for allowing them into their homes and fields to collect samples.

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  1. Institute of Geographic Sciences and Natural Resources Research, Beijing, 100101, China

    Rahib Hussain & Kunli Luo

  2. University of Chinese Academy of Sciences, Beijing, 10080, China

    Rahib Hussain

  3. State Key Laboratory of Coal Resources and Safe Mining, Beijing, 100083, China

    Handong Liang & Xiuping Hong

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Hussain, R., Luo, K., Liang, H. et al. Impact of the coal mining-contaminated soil on the food safety in Shaanxi, China. Environ Geochem Health 41, 1521–1544 (2019). https://doi.org/10.1007/s10653-018-0233-6

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