Abstract：
:Sixty nine participants in the United Kingdom national external quality assessment scheme for drugs of abuse in urine reported details of their sample extraction technique by questionnaire. Laboratories were categorised by differences in technique and their analytical test results compared for samples containing D-amfetamine 0.4 (4) and 0.8 (3) mg/l, morphine 0.4 (4) and 0.8 (4)mg/l, and benzoylecgonine 0.15/0.2 (2) and 0.45/0.5 (4) mg/l. Values in parentheses are numbers of samples. For amfetamine, there was no significant difference in the frequency of true positive results between liquid-liquid or solid phase extraction and the Toxi-Lab A system at 0.8 mg/l. Toxi-Lab A gave significantly fewer positives when operating below its specified threshold at 0.4 mg/l. Paradoxically, laboratories using >5 ml urine volume performed less well. Acidification of the extract before volume reduction gave significantly more true positives. For extraction of morphine, solid phase systems significantly outperformed both liquid-liquid and the Toxi-Lab A system at both 0.8 and 0.4 mg/l. No significant differences between extraction techniques were demonstrated for analysis of benzoylecgonine.
journal_name
Forensic Sci Intjournal_title
Forensic science internationalauthors
Wilson JF,Smith BL,Toseland PA,Watson ID,Williams J,Thomson AH,Capps NE,Sweeney G,Sandle LN,Steering Committee for the United Kingdom National External Quality Assessment Scheme for Drug Assays.doi
10.1016/s0379-0738(00)00383-2keywords:
subject
Has Abstractpub_date
2001-06-01 00:00:00pages
23-7issue
1eissn
0379-0738issn
1872-6283pii
S0379073800003832journal_volume
119pub_type
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