Sea water samples collected in August, 1994 from 20 stations in the Kwangyang Bay were analyzed by gas chromatography/mass spectrometry-selected ion monitoring (GC/MS-SIM) to investigate persistence and distribution pattern of four organophosphorus pesticides (DDVP, Diazinon, IBP, EDDP). Except for ...
Sea water samples collected in August, 1994 from 20 stations in the Kwangyang Bay were analyzed by gas chromatography/mass spectrometry-selected ion monitoring (GC/MS-SIM) to investigate persistence and distribution pattern of four organophosphorus pesticides (DDVP, Diazinon, IBP, EDDP). Except for IBP, the contamination by DDVP, Diazinon, and EDDP in marine aquatic environment in Korea has not been reported previously. In this study, however, all these four pesticides were detected in all stations (except DDVP) and their concentrations were in ng/L level. The concentrations ranged from detection limit to 15.3ng/L for DDVP, 1.8-27.7ng/L for Diazinon, 7.3-63.5ng/L for IBP, and 22.2-1100.1ng/L for EDDP. It is noteworthy that the measured concentrations of IBP and EDDP in this study would be much lower than usual, since the use of IBP and EDDP was less than 50% of average annual consumption due to unusually dry and hot weather condition in the summer of 1994. It was very surprising to find that the highest concentrations of organophosphorus pesticides were observed at stations near Daesa Streamlet instead of Seomjin River, which has more point source of the pesticides. This result suggests that the small river discharge during heavy ram period in summer can give harmful effect on marine biota (both wild and aqua-cultured) with its organophosphorus pesticide residue, despite of their short residence time in aquatic environment. In order to protect the marine life properly from acute toxicity of the organophosphorus pesticides, it needs to be emphasized that monitoring the level of agricultural pesticides in river run-off should be done during active consumption period rather at regular intervals.
Sea water samples collected in August, 1994 from 20 stations in the Kwangyang Bay were analyzed by gas chromatography/mass spectrometry-selected ion monitoring (GC/MS-SIM) to investigate persistence and distribution pattern of four organophosphorus pesticides (DDVP, Diazinon, IBP, EDDP). Except for IBP, the contamination by DDVP, Diazinon, and EDDP in marine aquatic environment in Korea has not been reported previously. In this study, however, all these four pesticides were detected in all stations (except DDVP) and their concentrations were in ng/L level. The concentrations ranged from detection limit to 15.3ng/L for DDVP, 1.8-27.7ng/L for Diazinon, 7.3-63.5ng/L for IBP, and 22.2-1100.1ng/L for EDDP. It is noteworthy that the measured concentrations of IBP and EDDP in this study would be much lower than usual, since the use of IBP and EDDP was less than 50% of average annual consumption due to unusually dry and hot weather condition in the summer of 1994. It was very surprising to find that the highest concentrations of organophosphorus pesticides were observed at stations near Daesa Streamlet instead of Seomjin River, which has more point source of the pesticides. This result suggests that the small river discharge during heavy ram period in summer can give harmful effect on marine biota (both wild and aqua-cultured) with its organophosphorus pesticide residue, despite of their short residence time in aquatic environment. In order to protect the marine life properly from acute toxicity of the organophosphorus pesticides, it needs to be emphasized that monitoring the level of agricultural pesticides in river run-off should be done during active consumption period rather at regular intervals.
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제안 방법
Recovery yields were measured for precision of the analysis. As shown in Fig.
So the concentrations of IBP and EDDP in winter (February) can be used minimum background level which is persistent throughout the year. The measurements of the organo phosphorus pesticides residues on the same 5 stations on both summer and winter were made to compare the maximum and minimum concentrations of the pes-ticides in sea water. The stations were selected to found a point source and distributions of the pesticides in Kwangyang Bay, which is typical bay in Korea.
대상 데이터
The four organophosphorus pesticides, DDVP, Diazinon, IBP and EDDP in seawater were analyzed by GC-MS-SIM and detected from all 20 stations in the Kwangyang bay except DDVP in August, 1994. The correlation between the concentrations of pesticide residue and salinity showed that the main source of the pesticide residue in seawater was Daesa streamlet in the study area.
The measurements of the organo phosphorus pesticides residues on the same 5 stations on both summer and winter were made to compare the maximum and minimum concentrations of the pes-ticides in sea water. The stations were selected to found a point source and distributions of the pesticides in Kwangyang Bay, which is typical bay in Korea.
이론/모형
Retention times for standards and relative retention time to internal standards are listed in Table 3. This analysis used MS-SIM mode for identification of organophosphorus pesticides. Each compound produces several ions and MS-SIM modes elects 2-3 characteristic ions fbr comparison.
The combination of these two factors (the short travel time and intensive use of these pesticides near the coastal region) imposes potential hazardous impacts on marine biota with their acute toxicity. This study use the sensitive and accurate analytical method of GC/MS-SIM to measure the level of concentrations of organophosphorus pesticides in seawater at Kwangyang Bay area, including the mouth of Seomjin River estuary, which is relatively less polluted river in Korean peninsula.
성능/효과
1994. The correlation between the concentrations of pesticide residue and salinity showed that the main source of the pesticide residue in seawater was Daesa streamlet in the study area. And at mixing zone, Seomjin reiver or Sueo river was main sources for IBP.
2, four organophosphorus pesticides s이utions in the artificial sea water (NaCl 35g/ distilled water 1 L) were extracted, concentrated and analyzed for 3 times. The recovery yields were obtained as 63.14 (±4.02)% for DDVP, 97.44 (士 14.76)% fbr Diazinon, 82.21(±10.58)% and 75.20(±9.40)% for EDDP. Detection Limits were determined as the concentrations corresponding to twice of the peak area of noises at specific concentrations.
In this study, CV were 3~7 % (Table 5), which 아lows that CV values of this experiment are in the range of permitted limit at 1 mg/L level. Thus, the results of this analysis for measurement of the pesticides are regards to be reliable with confidence at 1 mg/L level and at lower than 1 mg/L.
참고문헌 (18)
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