Zhang Qiji, Liu Liu, Jiang Yue, Zhang Yan, Fan Yifan, Rao Wenxin, Qian Xin
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China; Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, Nanjing 21004, China.
Environ Pollut. 2023 Apr 15;323:121225. doi: 10.1016/j.envpol.2023.121225. Epub 2023 Feb 7.
Microplastics can be found almost everywhere and extensively expose to human. Infants are vulnerable, and the potential risks of microplastics may be greater for infants, however, infants' microplastic exposure is still poorly understood. Since milk powder makes up a significant portion of many infants' diets, we investigated microplastic pollution in infant milk powder and calculated the microplastic exposure from milk powder, feeding bottles and milk powder preparation. On one hand, we studied 13 different types of milk powder with different packaging, processing systems, and milk sources. The boxed milk powder (7 ± 3 items/100 g) was more polluted with microplastics than the canned milk powder (4 ± 3 items/100 g). The inner packaging of the boxed milk powder was plastic and aluminum foil laminated, it emitted 8 ± 2 to 17 ± 1 items/100 g of microplastics, and might be a main source of microplastics in boxed milk powder. On the other hand, we found that when infants consume milk powder, the microplastic exposure from milk powder itself is little, exposure from feeding bottles is 6.8 times higher than that from milk powder and milk powder preparation is 1.7 times higher.
微塑料几乎无处不在，且人类广泛接触到微塑料。婴儿较为脆弱，微塑料对婴儿的潜在风险可能更大，然而，人们对婴儿接触微塑料的情况仍知之甚少。由于奶粉在许多婴儿的饮食中占很大一部分，我们调查了婴儿奶粉中的微塑料污染情况，并计算了奶粉、奶瓶和冲调奶粉过程中微塑料的摄入量。一方面，我们研究了13种不同类型的奶粉，它们具有不同的包装、加工系统和奶源。盒装奶粉（每100克含7±3个微塑料颗粒）的微塑料污染程度高于罐装奶粉（每100克含4±3个微塑料颗粒）。盒装奶粉的内包装是塑料和铝箔复合的，每100克会释放8±2至17±1个微塑料颗粒，这可能是盒装奶粉中微塑料的主要来源。另一方面，我们发现婴儿食用奶粉时，奶粉本身的微塑料摄入量很少，奶瓶的微塑料摄入量比奶粉高6.8倍，冲调奶粉过程的微塑料摄入量比奶粉高1.7倍。
