In the present study, girls exhibited significantly higher concentrations
of trace metals in hair than boys , thus supporting
previous reports . This observation can be accounted
for by the different growth rate of hair among individuals since a
larger trace metal accumulation is expected with a slower rate of
hair growth. Nevertheless, there are some controversial
results as Olivero-Verbel et al. and Sanna et al.
found males with significantly greater Hg and Pb levels than
females.
The greatest urine As concentrations were found in children
drinking well or spring water (Table 3). Liu et al. (2010) suggested
that different As concentrations in drinking water could influence
arsenic levels in children. Although trace metal levels have been
related with the area of residence, our study found that living in
urban, metropolitan or rural areas does not contribute significantly
to metal concentrations in urine except for Hg. This finding was
also reported by Aguilera et al. (2010) near our study area.
The correlation between metal levels in hair and other biological
samples, such as blood or urine, used for the assessment of
environmental exposures, has been previously addressed for biomonitoring
purposes . Our results have found a
correlation between urine and hair trace metal concentrations only
for mercury . However, while hair content is related to
past exposures, urinary levels reflect recent exposure except for
Cd. This toxicokinetic difference may account for the lack of correlations
found in this study.
In the present study, girls exhibited significantly higher concentrationsof trace metals in hair than boys , thus supportingprevious reports . This observation can be accountedfor by the different growth rate of hair among individuals since alarger trace metal accumulation is expected with a slower rate ofhair growth. Nevertheless, there are some controversialresults as Olivero-Verbel et al. and Sanna et al.found males with significantly greater Hg and Pb levels thanfemales.The greatest urine As concentrations were found in childrendrinking well or spring water (Table 3). Liu et al. (2010) suggestedthat different As concentrations in drinking water could influencearsenic levels in children. Although trace metal levels have beenrelated with the area of residence, our study found that living inurban, metropolitan or rural areas does not contribute significantlyto metal concentrations in urine except for Hg. This finding wasalso reported by Aguilera et al. (2010) near our study area.The correlation between metal levels in hair and other biologicalsamples, such as blood or urine, used for the assessment ofenvironmental exposures, has been previously addressed for biomonitoringpurposes . Our results have found acorrelation between urine and hair trace metal concentrations onlyfor mercury . However, while hair content is related topast exposures, urinary levels reflect recent exposure except forซีดี ความแตกต่างนี้ toxicokinetic อาจบัญชีสำหรับขาดความสัมพันธ์พบในการศึกษานี้
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