Heavy Metal Concentrations in Rice from Guangzhou and Associated Health Risks

doi:10.5814/j.issn.1674-764x.2018.01.010

Abstract

Abstract: In recent years, excessive levels of cadmium (Cd) in rice have been a focus of attention of the government, the public and scientists. In Guangzhou rice is a staple food for most citizens and understanding the level of Cd and other heavy metals in rice is important for food safety and health. Consumers in different income groups purchase rice from various sources at different prices but we know little about the relationship between price and safety. At the same time, the presence of zinc (Zn) can also affect the level of risk from Cd in rice and so affect food safety. This study offers a preliminary exploration of interactions between price, safety and nutritional quality. 125 rice samples were collected from markets and from the homes of high-income, middle-income and low-income groups in Guangzhou city, and were tested for the content of Cd and Zn. The results showed that 25.6% of the rice samples contained Cd in excess of the national standard, with higher levels of Cd in Indica rice than in Japonica. At the same time, we designed a questionnaire survey for groups with different incomes to assess their exposure to risks from rice with Cd and their perceptions and sources of information about risks. The survey showed that, as a whole, the low-income group faces higher risks from rice with Cd, and that there is strong public demand for scientific information about Cd in rice.

Key words: cadmium, groups with different income, Guangzhou, rice, risk

CHEN Nengchang, ZHANG Xiaoxia, ZHENG Yuji. Heavy Metal Concentrations in Rice from Guangzhou and Associated Health Risks[J]. Journal of Resources and Ecology, 2018, 9(1): 85-91.

References

[1] Chaney R L, J S Angle, M S Mcintosh, et al. . 2005. Using hyperaccumulator plants to phytoextract soil Ni and Cd. Zeitschrift Fur Naturforschung Section C-a Journal of Biosciences , 60(4): 190-198.
[2] Chaney R L, P G Reeves, and J S Angle. 2001. Rice plant nutritional and human nutritional characteristics role in human Cd toxicity. In: Horst WJ (Ed.), In Plant Nutrition: Food Security and Sustainability of Agro- Ecosystems Through Basic and Applied Research , The Netherlands, Kluwer Academic Publishers/Dordrecht, 288-289.
[3] Chaney R L, J A Ryan, Y M Li, et al. . 1999. Soil Cadmium as a Threat to Human Health. In: McLaughlin MJ and Singh BR eds. Cadmium in Soils and Plants . Kluwer Academic Publishers. 85: 219-256.
[4] Department of Health, Executive Yuan, 2004. Limit Standard for Heavy metals in Edible Rice. Wei Shu Shi Zi Announcement No. 0930402094. (in Chinese)
[5] Fox MRS, R M Jacobs, AOL Jones, et al.. 1979. Effects of nutritional factors on metabolism of dietary cadmium at levels similar to those of man. Environmental Health Perspectives, 28(28): 107-114.
[6] Jones K C, C J Symon, and A E Johnston. 1987. Retrospective analysis of an archived soil collection II Cadmium. Science of The Total Environment, 67(1): 75-89.
[7] Holdaway J, and W Y Wang. 2018. From soil pollution to “cadmium rice” to public health impacts: An interdisciplinary analysis of influencing factors and possible responses. Journal of Ecology and Resources , 9(1):10-20.
[8] Minh N D, R Hough, L T Thuy, et al.. 2012. Assessing dietary exposure to cadmium in a metal recycling community in Vietnam: Age and gender aspects. Science of the Total Environment, 416(2): 164-171.
[9] Nogawa K, and M Kido. 1996. Itai-itai disease and health effects of cadmium. In: Chang, L.W. (Ed.), Toxicology of Metals , CRC Lewis Publishers, NY, pp. 353-370.
[10] Nogawa K, T Kido, M Nishijo, et al.. 2015. Benchmark dose of cadmium concentration in rice for renal effects in a cadmium-polluted area in Japan. Journal of Applied Toxicology, 35(1): 24-28.
[11] Nogawa K, E Kobayashi, Y Okubo, et al. . 2004. Environmental cadmium exposure, adverse effects and preventive measures in Japan. BioMetals, 17(5): 581-587.
[12] Nogawa K, M Sakurai, and M Ishizaki. 2017. Threshold limit values of the cadmium concentration in rice in the development of itai-itai disease using benchmark dose analysis. Journal of Applied Toxicology, 37: 962-966.
[13] Nakashima K, E Kobayashi, K Nogawa, et al.. 1997. Concentration of cadmium in rice and urinary indicators of renal dysfunction. Occupational and Environmental Medicine, 54(10): 750-755.
[14] National Health and Family Planning Commission of the People's Republic of China, China Food and Drug Administration, 2017. National food safety standard. Maximum levels of contaminants in foods GB2762- 2017. (in Chinese)
[15] Osawa K, E Kobayashi, Y Okubo, et al. . 2001. A retrospective study on the relation between renal dysfunction and cadmium concentration in rice in individual hamlets in the Jinzu River basin. Toyama Prefecture, Japan. Environmental Research, 86(1): 51-59.
[16] Reeves P G, and R L Chaney. 2001. Mineral nutrient status of female rats affects the absorption and organ distribution of cadmium from sunflower kernels ( Helianthus annuus L.). Environmental Research, 85(3): 215-225.
[17] Reeves P G, and R A Vanderpool. 1998. Organ content and fecal excretion of cadmium in male and female rats consuming variable amounts of naturally occurring cadmium in confectionery sunflower kernels ( Helianthus annuus L.). The Journal of Nutritional Biochemistry, 9(11): 636-644.
[18] Tucker P G. 2011. Cadmium toxicity: What is the biological fate of cadmium in the body? Agency for Toxic Substances and Disease Registry (ATSDR): Case Studies in Environmental Medicine, Cadmium Toxicity: 10-44.
[19] Watanabe Y, E Kobayashi, Y Okubo, et al. . 2002. Nogawa Relationship between cadmium concentration in rice and renal dysfunction in individual subjects of the Jinzu river basin determined using a logistic regression analysis. Toxicology, 172(2): 93-101.
[20] World Health Organization (WHO). 2007. Codex General Standard for Contaminants and Toxins in Foods. CODEX STAN 193-1995, Rev. 3-2007.
[21] Zhen Y H, Y J Cheng, G X Pan, et al.. 2008. Levels of Cd, Zn and Se in rice on sale in some Chinese cities and their food safety assessment. Journal of Safety and Environment, 8: 119-122. ( in Chinese)