1
|
Zhang T, Ma Y, Wang D, Li R, Chen X, Mo W, Qin X, Sun H, Kannan K. Placental transfer of and infantile exposure to perchlorate. CHEMOSPHERE 2016; 144:948-954. [PMID: 26432537 DOI: 10.1016/j.chemosphere.2015.09.073] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 09/17/2015] [Accepted: 09/18/2015] [Indexed: 06/05/2023]
Abstract
Fetuses and infants are vulnerable to perchlorate toxicity. We assessed fetal and infantile exposure to perchlorate in two Chinese cities (Nanchang and Tianjin). Perchlorate was widely found (82%-100%) in breast milk, dissolved infant formula, infants' urine, maternal and cord blood samples. Perchlorate levels in infants' urine (mean ± standard deviation: 22.4 ± 35.6 ng mL(-1)), breast milk (36.6 ± 48.1 ng mL(-1)), and cord blood (3.18 ± 3.83 ng mL(-1)) samples collected from Nanchang and Tianjin were approximately an order of magnitude higher than those reported for the U.S. Perchlorate concentrations in cord blood were comparable to that in maternal blood, indicating that perchlorate is transferred from mother to fetus through placenta. Among all infants providing urine samples, the average daily intake of perchlorate (DOSEU) was estimated to be 1.17 ± 1.57 μg kg(-1) bw d(-1), and 40% of these infants had DOSEU exceeding the RfD (0.7 μg kg(-1) bw d(-1)) recommended by U.S. EPA. However, approximately 70% of exclusively breast-fed infants had perchlorate exposure dose via breast milk exceeding the RfD. For breast-fed infants, breast milk was the overwhelmingly predominant exposure pathway; while infant formula and indoor dust ingestion were major perchlorate exposure sources for formula-fed infants. To our knowledge, this is the first report to assess the fetal and infantile exposure to perchlorate in China.
Collapse
Affiliation(s)
- Tao Zhang
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-Sen University), Guangzhou 510275, China; College of Environmental Sciences and Engineering, Nankai University, Tianjin 300071, China.
| | - Yufang Ma
- College of Environmental Sciences and Engineering, Peking University, Beijing, China
| | - Dou Wang
- College of Environmental Sciences and Engineering, Nankai University, Tianjin 300071, China
| | - Rudan Li
- College of Environmental Sciences and Engineering, Nankai University, Tianjin 300071, China
| | - Xiaojia Chen
- College of Environmental Sciences and Engineering, Nankai University, Tianjin 300071, China
| | - Weiwen Mo
- College of Environmental Sciences and Engineering, Nankai University, Tianjin 300071, China
| | - Xiaolei Qin
- College of Environmental Sciences and Engineering, Nankai University, Tianjin 300071, China; Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Tianjin 300071, China
| | - Hongwen Sun
- College of Environmental Sciences and Engineering, Nankai University, Tianjin 300071, China; Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Tianjin 300071, China.
| | - Kurunthachalam Kannan
- Wadsworth Center, New York State Department of Health, and Department of Environmental Health Sciences, School of Public Health, State University of New York at Albany, Albany, NY 12201, USA
| |
Collapse
|
2
|
Sanchez CA, Blount BC, Valentin-Blasini L, Lesch SM, Krieger RI. Perchlorate in the feed-dairy continuum of the southwestern United States. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:5443-5450. [PMID: 18553887 DOI: 10.1021/jf0733923] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Perchlorate has the potential to cause thyroid dysfunction by inhibiting iodide uptake by the sodium iodide symporter. Perchlorate-contaminated waters may lead to human exposure through drinking water and food chain transfer in crops by way of irrigation water. Perchlorate has been found in dairy milk collected nationally and internationally. This study was conducted to evaluate perchlorate in the feed-dairy continuum in the southwestern United States. All feed products collected at dairies in this study had detectable levels of perchlorate as analyzed by ion chromatography-tandem mass spectrometry. The calculated total perchlorate intake across dairies ranged from 1.9 to 12.7 mg/cow per day. The variation in total perchlorate intake across dairies was largely associated with variation in forage and silage products. Alfalfa products were the single most important source of perchlorate intake variability among dairies. The estimated perchlorate intake from drinking water ranged from 0.01 mg per cow per day and was generally less than 2% of the total perchlorate intake. The perchlorate content of milk ranged from 0.9 to 10.3 microg/L and was similar to levels reported by the Food and Drug Administration's Total Diet Study. The perchlorate content of milk was significantly related to the presence of perchlorate in feed but the variation of perchlorate in milk could not be explained by feed intake alone.
Collapse
Affiliation(s)
- C A Sanchez
- Department of Soil, Water, and Environmental Sciences, Yuma Agricultural Center, The University of Arizona, Yuma, Arizona 85364, USA
| | | | | | | | | |
Collapse
|