16:45 〜 17:00
[AAS11-06] On the possibility of continuation of long-term environmental monitoring data series of POPs in case of change of analytical methods
キーワード：Pesticides, Precipitation chemistry, Persistent Organic Pollutants, Data series, pollution
Due to changes in analytical equipment in the central laboratory of the Integrated Background Monitoring Network (IBMoN) in Russia (located in IGCE), the continuous regular measurements of Persistent organic pollutants (POP) at environmental background monitoring sites was temporarily interrupted. The long-term data series started in the late of 1980s with the gradual improvement of the analytical methodology, and we had obtained data for certain sites permanently until 2018. The list of measured POPs includes α-HCH, γ-HCH, p,p'-DDE, p,p'-DDD, p,p'-DDT which were mostly widespread and of concern since the middle of XX century.
Last year we resumed pesticide analysis after the purchase of new equipment. In addition, stricter quality assurance and quality control (QA/QC) measures were implemented taking into consideration a risk of potential errors in the analytical processes. However, chemical analytical methods for POPs had evolved over the past decades due to progressive changes in instrumentation and sampling techniques procedures, as well as in sample preparation methods. Thus, in a year after the analyses were renewed, we were faced with necessity to consider whether or not it is possible to use the archived long-term monitoring data series in our current assessment of environmental contamination in background areas with POPs.
From February 2024, the water samples for pesticide analysis were collected at four sites of the IBMoN in Russia: Voronezh Nature Reserve, Astrakhan Nature Reserve, Altay Nature Reserve, and Oka-Terrase Nature Reserve. These natural environmental waters collected are represent an atmospheric precipitation (monthly collected samples) and surface water (samples periodically taken in river stream or small natural lakes).
From archived data for 2000-2015 we knew that the annual averages of HCH and DDT (as sum of isomers) in precipitation were at the lowest level of 5-8 and 35-70 ng/L, respectively. Their concentration values were below detection limits in more than 30% of the samples collected.
Looking at the data for the last year, it was noted that the detection limit was better lowered with the new apparatus, resulting in a significant number of results no longer marked as "below detection limit". The within-year variability showed an increase in DDT during the summer period, similar to previous years. Overall, the characteristics of the data are consistent with archived long-term monitoring results.
At first estimation, we can conclude that it is possible to use previous data to create comparable data series. At the very least, the levels of the data and the intra-annual dynamics could be further evaluated. However, with only a short set of acquired results, it is too early to determine whether the series can be conjuncted or whether the calculation of the necessary corrections needs to be done.
This study was carried out in the framework of the Research Project "Development and modernization of methods and technologies for integrated background monitoring and comprehensive assessment of the state and pollution of the Russian environment and its dynamics (based on integrated results of Roshydromet monitoring networks)". Evaluation of archived data was done under the state research theme FMWS-2024-0009 №1023032700199-9 of the Institute of Geography RAS.
Last year we resumed pesticide analysis after the purchase of new equipment. In addition, stricter quality assurance and quality control (QA/QC) measures were implemented taking into consideration a risk of potential errors in the analytical processes. However, chemical analytical methods for POPs had evolved over the past decades due to progressive changes in instrumentation and sampling techniques procedures, as well as in sample preparation methods. Thus, in a year after the analyses were renewed, we were faced with necessity to consider whether or not it is possible to use the archived long-term monitoring data series in our current assessment of environmental contamination in background areas with POPs.
From February 2024, the water samples for pesticide analysis were collected at four sites of the IBMoN in Russia: Voronezh Nature Reserve, Astrakhan Nature Reserve, Altay Nature Reserve, and Oka-Terrase Nature Reserve. These natural environmental waters collected are represent an atmospheric precipitation (monthly collected samples) and surface water (samples periodically taken in river stream or small natural lakes).
From archived data for 2000-2015 we knew that the annual averages of HCH and DDT (as sum of isomers) in precipitation were at the lowest level of 5-8 and 35-70 ng/L, respectively. Their concentration values were below detection limits in more than 30% of the samples collected.
Looking at the data for the last year, it was noted that the detection limit was better lowered with the new apparatus, resulting in a significant number of results no longer marked as "below detection limit". The within-year variability showed an increase in DDT during the summer period, similar to previous years. Overall, the characteristics of the data are consistent with archived long-term monitoring results.
At first estimation, we can conclude that it is possible to use previous data to create comparable data series. At the very least, the levels of the data and the intra-annual dynamics could be further evaluated. However, with only a short set of acquired results, it is too early to determine whether the series can be conjuncted or whether the calculation of the necessary corrections needs to be done.
This study was carried out in the framework of the Research Project "Development and modernization of methods and technologies for integrated background monitoring and comprehensive assessment of the state and pollution of the Russian environment and its dynamics (based on integrated results of Roshydromet monitoring networks)". Evaluation of archived data was done under the state research theme FMWS-2024-0009 №1023032700199-9 of the Institute of Geography RAS.