Concept: ALS_S_SMLGMS02 in the ANALYS_MET vocabulary

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Concept URI	https://kodlistor.miljodatasamverkan.se/def/vocabulary/DATA_MATVARDE/ANALYS_MET/ALS_S_SMLGMS02
Preferred label	ALS_S_SMLGMS02
Definition	S-SMLGMS02 - ALS analysmetod för bestämning och beräkning av semivolatila organiska ämnen i i jord, slam och sediment. Analys av PAH-16 och PCB-7 med isotoputspädning enligt US EPA 429, US EPA 1668, US EPA 3550. Mätning utförs med GC-MS. "The principle of the method is the microwave extraction of analytes from a sample of freeze-dried sea or river sediment into an organic solvent (acetone+hexane, the final extract is in hexane). The portion of the organic extract is concentrated and directly dosed into the gas chromatograph, where the analytes are separated on the chromatographic column and their detection is performed by a mass detector in the MRM (Multiple Reaction Monitoring) mode. Quantification is performed using the internal (extraction) standard method. The internal standard extraction method is classified according to EPA 8000C as a hybrid between the internal standard method and the isotopic dilution method (http://www.epa.gov/osw/hazard/testmethods/pdfs/8000c_v3.pdf). An extraction (internal) standard is added into the freeze-dried philized sediment sample before extraction, which is otherwise commonly used as an internal standard added into extracts prior to injection into the gas chromatograph. These are either deuterated analogues of the target analytes, or substances very similar to the target analytes that do not occur in freeze dried sediment samples. These internal standards are also added in the same amount to the calibration solutions, and a calibration curve is constructed as a function of the ratio of the concentrations of the target analyte and the internal standard (x-axis) to the ratio of the responses of the target analyte and the internal standard (y-axis). The amount of analyte in the sample is calculated using the evaluation software MassHunter."
Notation
Status	Valid
Status Modified	2025-07-08
Accepted Date	2025-07-08
Not Accepted Date