Table 3.1.   Performance of the analytical method using two LC-MS systems. Limit of quantification is determined as three times the standard deviation of samples at the 20 ng/l level. Recovery and uncertainty are determined at the 100 ng/l level using data from the recovery samples obtained from quality control during the study. Tabel 3.1.   Ydeevne for den analytiske metode med brug af to LC-MS systemer. Kvantificeringsgrænsen er bestemt som tre gange standardafvigelsen af prøver på 20 ng/l niveau. Genfinding og usikkerhed er bestemt på 100 ng/l niveau ud fra genfindingsprøver, der er anvendt til kvalitetskontrol i forbindelse med dette projekt. Compound Limit of quantification, ƒÊg/l Recovery (%) Uncertainty of measurements (%) 1st System 2nd System 1st System 2nd System 1st System 2nd System Atrazine 0,001 0,004 94 ± 7 109 ± 2 16 8 BAM (2,6-dichlorobenzamide) 0,010 0,006 84 ± 12 65 ± 3 25 9 Carbofuran 0,008 0,023 82 ± 11 73 ± 7 20 21 Chloridazon 0,003 0,004 112 ± 8 79 ± 2 17 6 Cyanazine 0,006 0,004 89 ± 19 88 ± 4 32 11 Desethylatrazine 0,007 0,007 105 ± 9 95 ± 3 19 9 Desethylterbuthylazin 0,002 0,006 112 ± 9 117 ± 2 21 7 Desisopropylatrazine 0,005 0,010 95 ± 7 82 ± 4 15 11 Dimethoate 0,011 0,004 123 ± 11 77 ± 3 23 9 Diuron 0,009 0,006 108 ± 6 121 ± 4 13 13 Ethofumesate 0,035 0,004 116 ± 7 131 ± 11 15 32 Fenpropimorph 0,058 0,023 109 ± 6 135 ± 6 6 18 Hexazinone 0,002 0,006 95 ± 18 112 ± 4 29 10 Hydroxy-atrazine 0,010 0,005 96 ± 10 36 ± 6 21 9 Hydroxy-carbofuran 0,007 0,029 54 ± 10 42 ± 3 16 7 Hydroxy-simazine 0,013 0,008 59 ± 16 58 ± 16 41 40 Hydroxy-terbuthylazine 0,006 0,004 105 ± 10 95 ± 4 21 12 Isoproturon 0,003 0,005 91 ± 6 118 ± 5 13 14 Linuron 0,009 0,002 101 ± 14 125 ± 3 28 9 Metamitron 0,010 0,004 76 ±  6 58 ± 3 12 9 Methabenzthiazuron 0,005 0,003 97 ± 2 120 ± 3 6 10 Metribuzin 0,007 0,011 113 ± 20 92 ± 3 40 9 Pendimethalin 0,026 0,006 38 ± 6 73 ± 10 12 31 Primicarb 0,004 0,004 96 ± 7 68 ± 3 15 9 Prochloraz 0,006 0,003 78 ± 7 124 ± 7 15 19 Propiconazol 0,007 0,003 116 ± 8 140 ± 7 17 21 Propyzamide 0,011 0,005 94 ± 7 126 ± 4 14 12 Simazine 0,003 0,008 45 ± 10 106 ± 2 21 7 Terbuthylazine 0,003 0,005 82 ± 8 96 ± 3 16 8 Triadimenol 0,004 0,005 107 ± 5 127 ± 8 9 23 2,4-D 0,002 0,005 96 ± 4 100 ± 2 29 11 2,4-dichlorophenol 0,021 0,014 76 ±16 113 ± 3 25 19 Benazolin 0,003 0,005 70 ± 12 40 ± 1 23 7 Bentazone 0,001 0,004 76 ± 11 45 ± 3 23 13 Bromoxynil 0,001 0,005 71 ± 10 97 ± 3 24 16 Chlorsulfuron 0,004 0,007 62 ± 11 30 ± 2 33 10 Dicamba 0,003 0,004 73 ± 18 34 ± 2 9 8 Dichlorprop 0,004 0,004 105 ± 4 115 ± 2 30 13 Dinoseb 0,004 0,008 96 ± 15 128 ± 3 19 18 DNOC 0,001 0,007 85 ± 9 84 ± 3 16 17 Flamprop 0,004 0,004 86 ± 7 87 ± 2 20 14 Fluazifop 0,009 0,009 91 ± 10 105 ± 2 19 13 Ioxynil 0,003 0,005 71 ± 9 108 ± 4 8 20 Lenacil 0,003 0,005 32 ± 4 31 ± 4 13 13 MCPA 0,003 0,005 84 ± 7 101 ± 2 18 11 Mecoprop 0,003 0,006 87 ± 9 111 ± 2 31 13 Metsulfuron-methyl 0,004 0,024 28 ± 12 30 ± 11 48 45 p-nitrophenol 0,003 0,007 30 ± 3 37 ± 4 10 10 Thifensulfuron-methyl 0,003 0,025 20 ± 6 19 ± 6 19 19 Triasulfuron 0,003 0,010 19 ± 6 20 ± 6 20 20