{"id":"W2061268822","doi":"10.1021/ac8027273","title":"Linear and Branched Perfluorooctane Sulfonate Isomers in Technical Product and Environmental Samples by In-Port Derivatization-Gas Chromatography-Mass Spectrometry","year":2009,"lang":"en","type":"article","venue":"Analytical Chemistry","topic":"Per- and polyfluoroalkyl substances research","field":"Environmental Science","cited_by":93,"is_retracted":false,"has_abstract":true,"ca_institutions":"Carleton University; Environment and Climate Change Canada","funders":"National Wildlife Research Center","keywords":"Chemistry; Derivatization; Perfluorooctane; Chromatography; Gas chromatography; Detection limit; Solid phase extraction; Mass spectrometry; Environmental chemistry; Gas chromatography–mass spectrometry; Sulfonate; Organic chemistry","routes":{"ca_aff":true,"ca_fund":false,"ca_venue":false,"about_ca":false,"invisible_to_affiliation_only":false},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"metacan-v3-hybrid-931329e0061c","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.0003550986,0.0008759133,0.00026726,0.001157818,0.0003871077,0.0003670653,0.0003494174,0.0005500423,0.0008068652],"category_scores_gemma":[0.0006269487,0.0002210426,0.0003822354,0.0007655935,0.0003714601,0.0003121655,0.0004196689,0.000474538,0.0004634066],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.0004560806,"about_ca_system_score_gemma":0.0008885119,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.002955836,"about_ca_topic_score_gemma":0.005775537,"domain_scores_codex":[0.9992923,0.00007244417,0.0000427355,0.0002050283,0.0003194945,0.00006804565],"domain_scores_gemma":[0.9997258,0.00004724617,0.0000768337,0.00002252077,0.000110104,0.00001749666],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"bench_or_experimental","study_design_gemma":"bench_or_experimental","study_design_scores_codex":[0.0001372753,0.00004885067,0.005006554,0.0001183051,0.00005403375,0.0001679807,0.00007603342,0.0003439132,0.9792978,0.0001658088,0.0001394158,0.01444406],"study_design_scores_gemma":[0.00001264846,0.000280608,0.02136666,0.00002520556,0.00008529485,0.0007849495,0.00009651191,0.004170223,0.9662981,0.0002304033,0.006614374,0.00003502951],"study_design_candidate":"bench_or_experimental","study_design_consensus":"bench_or_experimental","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.8926885,0.005487235,0.09056767,0.0001840304,0.0001065902,0.0003513199,0.003063083,0.0008509011,0.00670064],"genre_scores_gemma":[0.8654565,0.005545646,0.1180433,0.0004458807,0.00005684842,0.0003644253,0.003249512,0.0001661203,0.006671689],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.002955836,"threshold_uncertainty_score":0.005877256,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.007066499957596726,"score_gpt":0.2381329629212141,"score_spread":0.2310664629636174,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). Scores rank; they never assert a category."}}