Agriculture Reference
In-Depth Information
RSDs of 277 standards with 2 LOQ concentrations are below 20%, accounting for
93.9% of the total. The recoveries of 252 standards with 4 LOQ concentrations are
between 60.0 and 120.0%, accounting for 85.4% of the total. The RSDs of 287
standards with 4 LOQ concentrations are below 20%, accounting for 97.3% of the
total. The above data show that the method has good reproducibility and is suitable for
the analysis of actual body fat samples.
5.3.7 Actual Sample Analysis
Six hundred and thirty-three human body adipose samples from different regions of
Jiangsu province of China (provided by Nanjing Institute of Environmental Science)
were analyzed with the above method. Complete analysis of one sample, including
sample preparation, instrument analysis, and data analysis, takes about 15 h. The
results are given in Table 5.5.
Table 5.5 shows that 70 environmental pollutants are detected in 655 samples
(including isomers, a total of 81), containing the following:
1.
POPs:
A total of seven kinds: DDT, HCH, aldrin, endrin, HCB, mirex, and
chlordane; among them, the positive rate of 4,4
´
-DDT was the highest (99.1%),
the positive rates of aldrin,
cis
-chlordane,
trans
-chlordane, and endrin were the
lowest (0.2%), and the difference between them was 496 times; the average
concentration of 4,4
´
-DDE was the highest (2220
μ
g/kg), the average concen-
tration of aldrin was the lowest (4.6
μ
g/kg), and the difference between them
was 483 times.
2.
PAHs:
A total of 15 kinds: phenanthrene, benzo(
k
)
uoranthene,
pyrene, benzo(
a
)anthracene, benzo(
g
,
h
,
i
)perylene, naphthalene, benzo(
a
)per-
ylene,
uoranthene,
indeno(1,2,3-
cd
)pyrene,
fluorine, acenaphthene, dibenzo(
a
,
h
)anthra-
cene, acenaphthylene, benzo(
b
)
uoranthene, and anthracene; among them,
the positive rate of
fluorine was the highest (86.4%), the positive rate of dibenzo
[
a
,
h
]anthracene was the lowest (21.8%), and the difference between them was
4.0 times; the average concentration of phenanthrenewas the highest (163.0
μ
g/kg),
the average concentration of benzo(
b
)
uoranthene was the lowest (5.1
μ
g/kg), and
the difference between them was 32.2 times.
3.
PAEs:
A total of three kinds: phthalic acid bis-2-ethylhexyl ester, phthalic acid
bis-butyl ester, and phthalic acid benzyl butyl ester; among them, the positive
rate and average concentration of phthalic acid bis-2-ethylhexyl ester were the
highest (46.9% and 970.6
g/kg, respectively), the positive rate and average
concentration of phthalic acid benzyl butyl ester were the lowest (7.6% and
10.3
μ
μ
g/kg, respectively), and the difference of positive rate between them
was 6.2 times and the difference of average concentration between them was
94.6 times.
4.
PCBs:
A total of 18 kinds: PCB 004, PCB 021, PCB 028, PCB 074, PCB 084,
PCB 099, PCB 101, PCB 102, PCB 118, PCB 127, PCB 138, PCB 153, PCB
163, PCB 168, PCB 180, PCB 190, PCB 192, and PCB 193; among them, the
