MaTestLab > ASTM Methods > ASTM D7645 Standard Test Method for Determination of Aldicarb and other related compounds in Water by Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
ASTM D7645 Standard Test Method for Determination of Aldicarb and other related compounds in Water by Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
ASTM D7645 deals with the identification of different carbamates, like aldicarb. In this test method, carbamates are determined in water directly injected by liquid chromatography and confirmed by electrospray ionization tandem mass spectrometry (ESI-MS/MS). This method uses multiple reaction monitoring mass spectrometry to identify and measure these analytes both qualitatively and quantitatively.
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ASTM D7645 Introduction
The EPA notes that N-methyl carbamate (NMC) pesticides interact with the nervous system by inhibiting enzymes, a crucial toxicological feature for food, water, and residential exposure. Generally, drinking water sources have low NMC concentrations, yet wells from permeable, acidic regions, which are exceptionally shallow private wells, are more susceptible. Two metabolites, aldicarb sulfone and sulfoxide, should also be monitored because of their toxicity. ASTM D7645 is also used on reagents, surfaces, and drinking water for these carbamates.
ASTM D7645 Test Method
Carbamate analysis
In the case of carbamate analysis, samples are shipped to the laboratory already acidified and are to be analyzed within 14 days of collection at a temperature of between 0°C and 6°C collection. In the lab, the samples are spiked with surrogates, filtered using a syringe-driven filter unit, and analyzed directly by LC/MS/MS.
Quantification
The target analytes and surrogate are quantified using the primary SRM transitions and an external calibration.
ASTM D7645 Equipment and Sample Preparation
Specimen Detail
Carbamates and carbamate-based products are used as specimens for this test standard.
Specimen Size
250 ng/L of each carbamate analyte is used in this test method.
ASTM D7645 Results and Interpretation
The ASTM D7645 method involves the identification of several N-methyl carbamate (NMC) pesticides in water through liquid chromatography ESI-MS/MS. The method detects low concentrations of carbamates and metabolites, which is essential for evaluating exposure potentials in sensitive water sources, such as shallow wells in permeable sediments. Positive results at these concentrations near regulatory limits may have implications for the nervous system.
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Tests Related to D7645
ASTM D7645 is related to tests, including ASTM D1193 for reagent water specifications, ASTM 3694 for sample container preparation, and ASTM D3856 for water analysis.
Use of ASTM D7645 Testing in Various Industries
This testing is commonly applied in agriculture, ecology, and water treatment to identify N-methyl carbamate pesticides in water. It helps to control the amount of pesticide residues in water to make water safe for agriculture, supports agencies that protect water sources, and enables water treatment plants to meet safety requirements by detecting toxic compounds.
Materials Commonly Tested with D7645
This standard is most commonly used on surface water, groundwater, reagent water, and drinking water for N-methyl carbamate pesticides.
Safety and Best Practices in D7645 Standard Testing
For testing, it is required to be safe when dealing with all the chemicals such as pesticides; wear gloves, goggles, and lab coats. Contacting and inhaling chemicals should be avoided, and chemical fume hoods should be used. Maintenance of instrumentation, particularly in LC-MS, should be well-checked to increase the accuracy of the systems. Waste disposal should be resolved based on the evaluation of hazardous materials to achieve the aims of safety and a protective environment.
Importance of ASTM D7645
The standard is crucial for the analysis and determination of N-methyl carbamate pesticides in water, which is essential for water safety for the people and the environment. This standard facilitates the delivery of accurate and reliable analysis to regulatory agencies in a bid to monitor any probable risks in the sources of drinking water, especially in sensitive regions. It helps to maintain consistent testing procedures and, therefore, ensures the safety of the environment and people.
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