Percorrer por autor "Tang, Wenli"
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- Contamination and carcinogenic risks of lead in lip cosmetics in ChinaPublication . Gong, Yu; Chu, Junru; Kwong, Raymond; Nunes, Luís; Zhao, Di; Tang, Wenli; Li, Chengjiu; Wei, Zhongbo; Ju, Yongming; Li, Hongbo; Ma, Lena Q.; Yu, Xiezhi; Zhong, HuanThere are growing concerns about elevated lead (Pb) levels in lip cosmetics, yet in China, the largest lip cosmetic market, recent Pb contamination in lip cosmetics and associated Pb exposure remain unclear. Here, we measured Pb levels of 29 popular lip cosmetics in China and conducted the bioaccessibility-corrected carcinogenic risk assessments and sensitivity analysis regarding Pb exposure for consumers using Monte Carlo simulation. The Pb concentrations of collected samples ranged from undetectable (< 0.05 mu g/kg) to 0.21 mg/kg, all of which were well below the Pb concentration limit set for cosmetics in China (10 mg/kg). The 50th percentile incremental lifetime cancer risk (ILCR) of Pb in Chinese cosmetics (1.20E-07) was below the acceptable level (1E-06), indicating that the application of lip cosmetics and subsequent Pb exposure does not pose carcinogenic risks to consumers in most cases. The results of this study provide new insights into understanding the Pb risk in lip cosmetics.
- A hidden demethylation pathway removes mercury from rice plants and mitigates mercury flux to food chainsPublication . Tang, Wenli; Bai, Xu; Zhou, Yang; Sonne, Christian; Wu, Mengjie; Lam, Su Shiung; Hintelmann, Holger; Mitchell, Carl P. J.; Johs, Alexander; Gu, Baohua; Nunes, Luís; Liu, Cun; Feng, Naixian; Yang, Sihai; Rinklebe, Jörg; Lin, Yan; Chen, Long; Zhang, Yanxu; Yang, Yanan; Wang, Jiaqi; Li, Shouying; Wu, Qingru; Ok, Yong Sik; Xu, Diandou; Li, Hong; Zhang, Xu-Xiang; Ren, Hongqiang; Jiang, Guibin; Chai, Zhifang; Gao, Yuxi; Zhao, Jiating; Zhong, HuanDietary exposure to methylmercury (MeHg) causes irreversible damage to 45 human cognition, and is mitigated by photolysis and microbial demethylation of MeHg. 46 Here, we report a hidden pathway of MeHg demethylation independent of light and 47 microorganisms. This natural pathway exists in crops and is driven by reactive oxygen 48 species generated in vivo, rapidly transforming MeHg to inorganic Hg and then 49 eliminating Hg from plants as gaseous Hg0 . Methylmercury concentrations in rice 50 grains would increase by 2.4- to 4.7-fold without this pathway, which equates to IQ 51 losses of 0.01−0.51 points/newborn in major rice consuming countries, corresponding 52 to annual economic losses of $30.7−84.2 billion USD globally. This newly discovered 53 pathway effectively removes Hg from human food webs, playing an important role in 54 exposure mitigation and global Hg cycling.
- Mercury supply limits methylmercury production in paddy soilsPublication . Zhong, Huan; Su, Yao; Wu, Xinda; Nunes, Luís; Li, Chengjun; Hao, Yunyun; Liu, Yu-Rong; Tang, WenliThe neurotoxic methylmercury (MeHg) is a product of inorganic mercury (IHg) after microbial transformation. Yet it remains unclear whether microbial activity or IHg supply dominates Hg methylation in paddies, hotspots of MeHg formation. Here, we quantified the response of MeHg production to changes in microbial activity and Hg supply using 63 paddy soils under the common scenario of straw amendment, a globally prevalent agricultural practice. We demonstrate that the IHg supply is the limiting factor for Hg methylation in paddies. This is because IHg supply is generally low in soils and can largely be facilitated (by 336-747 %) by straw amendment. The generally high activities of sulfate-reducing bacteria (SRB) do not limit Hg methylation, even though SRB have been validated as the predominant microbial Hg methylators in paddies in this study. These findings caution against the mobilization of legacy Hg triggered by human activities and climate change, resulting in increased MeHg production and the subsequent flux of this potent neurotoxin to our dining tables.