Environmental Engineering Reference
In-Depth Information
ResultsandDiscussion
Hair Test
According.to.Table.3.1,.the.concentrations.of.4.of.the.12.heavy.metals.tested.
all.exceeded.their.respective.reference.ranges,.especially.mercury.in.Hong.
Kong.samples.(exceeded.7.47.times),.lead.in.Mainland.China.samples.(5.26.
times),.and.arsenic.in.Mainland.China.samples.(4.87.times)..Mainland.China.
samples.contained.signiicantly.higher.(p.<.0.05).lead.and.arsenic.but.lower.
mercury.than.Hong.Kong.samples.
Urine Test
Table.3.2.shows.that.6.h.after.the.children.were.administered.DMSA,.a.sub-
stantial.amount.of.the.four.heavy.metals.were.detected.in.the.urine..All.met-
als.exceeded.their.respective.reference.ranges,.especially.lead.(9.77.times.and.
3.58. times. in. Mainland. China. and. Hong. Kong. samples,. respectively). and.
mercury.(2.03.times.and.2.65.times.in.Mainland.China.and.Hong.Kong.sam-
ples,.respectively)..A.signiicantly.higher.(p.<.0.05).concentration.of.lead.was.
observed.in.Mainland.China.samples.than.in.Hong.Kong.samples,.whereas.
no. signiicant. differences. were. noted. in. concentrations. of. the. other. three.
metals.between.Mainland.China.and.Hong.Kong.samples.
Blood Test
Table. 3.3. shows. the. concentrations. of. mercury,. cadmium,. and. lead. which.
all. exceeded. their. respective. ranges,. especially. lead. (0.61. and. 0.3. times. in.
TABLE 3.1
Concentrations.of.Heavy.Metals.in.the.Hair.Samples.of.the.Children.
with.Autism
Heavy
Metal
Concentrations
(μg/g)
Reference
Range(μg/g)
Excess
Multiple
District
Mercury
Mainland.China
0.917.±.1.018*
2.29
Hong.Kong
2.99.±.3.18
<0.4
7.47
Lead
Mainland.China
5.26.±.7.96*
5.26
Hong.Kong
3.27.±.3.15
<1
3.27
Cadmium
Mainland.China
0.238.±.0.768
1.59
Hong.Kong
0.215.±.0.531
<0.15
1.43
Arsenic
Mainland.China
0.389.±.0.443*
4.87
Hong.Kong
0.177.±.0.133
<0.08
2.21
* . Indicates.signiicant.difference.p.<.0.05,.according.to.student's.t-test.
Reference. Range. is. collected. according. to. Doctor 's. Data,. Inc.. (DDI). from.
America.
 
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