Table 2. Time-weighted mean (TWM) and maximal concentrations as well as the frequency of detection (FOD_LOQ) of all detected pesticides during all sampling events.

Substance	LOQ [ng/L]	Langder Flutgraben (n = 5) [ng/L]			Waschbach (n = 10) [ng/L]			Weidgraben (n = 5) [ng/L]
		TWM a	Max b	FOD LOQ [%]	TWM a	Max b	FOD LOQ [%]	TWM a	Max b	FOD LOQ [%]
Bifenox-free acid	20	<LOQ	<LOQ	0	<LOQ	<LOQ	0	<LOQ	79	20
Carbendazim	1	2.6	14	80	8.8	44	100	<LOQ	3.7	20
Clomazone	2	<LOQ	<LOQ	0	3.6	31	90	3.7	17	40
Clothianidin	5	<LOQ	<LOQ	0	5.4	98	30	<LOQ	<LOQ	0
Chloridazone	20	<LOQ	<LOQ	0	53	1,800	40	<LOQ	<LOQ	0
Chlortoluron	2	<LOQ	<LOQ	0	2.7	10	40	<LOQ	12	20
Difenoconazole	1	<LOQ	5.6	60	1.4	9.2	90	<LOQ	<LOQ	0
Diflufenican	1	16	47	100	2.9	13	100	<LOQ	2	40
Dimethachlor	2	<LOQ	<LOQ	0	10	140	100	21	230	60
Dimethachlor-ESAc	5	9.5	14	100	15	53	100	240	1,400	100
Dimethachlor-OAd	5	<LOQ	5.1	20	6.9	46	40	180	1,100	80
Dimethenamide	2	9.9	65	100	65	740	100	16	160	100
Dimethenamide-ESAc	10	12	35	60	19	54	100	29	120	80
Dimethenamide-OAd	20	<LOQ	<LOQ	0	<LOQ	30.9	10	<LOQ	79	60
Dimethomorph	2	2.2	17	20	9.7	103	90	<LOQ	3.5	60
Diuron	1	<LOQ	7.9	60	4.1	20.0	90	<LOQ	1.2	40
DCPMUe	0.5	<LOQ	1.1	40	0.8	2.7	90	<LOQ	0.5	20
Epoxiconazole	1	26	140	100	23	230	100	4.8	29	100
Fenpropimorph	2	4.3	87	60	<LOQ	21	30	<LOQ	<LOQ	0
Fluazifop	5	<LOQ	12	40	5.1	120	80	<LOQ	<LOQ	0
Flufenacet	2	14	140	100	64	950	100	7.7	43	80
Flufenacet-ESA	5	12	72	100	6.3	24	60	8.5	50	100
Flufenacet-OA	10	17	59	100	<LOQ	30	60	<LOQ	48	60
Flurtamon	1	24	96	100	3.9	81	90	<LOQ	1.0	20
Imidacloprid	5	<LOQ	5.0	20	<LOQ	37	30	<LOQ	<LOQ	0
Irgarol	0.5	<LOQ	<LOQ	0	0.9	9.4	90	<LOQ	<LOQ	0
Isoproturon	0.5	1.5	8.4	80	28	560	100	2.5	40	60
Mecoprop	2	4.5	38	60	34	250	90	<LOQ	<LOQ	0
Metamitron	10	<LOQ	<LOQ	0	2,600	78,000	80	210	1,300	40
Desamino-Metamitron	5	<LOQ	21	80	400	5,100	90	22	120	60
Metazachlor	1	2.8	18	80	340	6,800	100	49	330	60
Metazachlor-ESAc	20	220	510	100	220	670	100	370	1,900	100
Metazachlor-OAd	20	59	200	100	120	380	100	250	1,200	100
Metolachlor	1	2,400	15,000	100	180	3,900	100	27	220	100
Metolachlor-ESAc	2	180	650	100	45	280	100	86	280	100
Metolachlor-OAd	5	180	700	100	19	260	100	11	77	80
Napropamide	10	<LOQ	<LOQ	0	<LOQ	110	30	<LOQ	25	40
Propiconazole	2	29	180	100	12	250	100	<LOQ	4.6	40
Propyzamide	1	1.0	2.1	100	4.2	37	100	1.3	13	80
Prosulfocarb	50	2,100	13,000	80	190	3,900	50	<LOQ	170	20
Prothioconazole-desthio	5	66	260	80	45	290	70	6.2	43	80
Quinmerac	5	<LOQ	7.7	40	260	3,400	100	200	1,400	80
Tebuconazole	1	20	110	100	36	210	100	13	100	100
Terbutryn	1	3.7	15	80	160	2,400	100	<LOQ	<LOQ	0
Terbuthylazine	1	1,500	8,700	100	41	260	100	21	150	100
2-Hydroxy-Terbuthylazine	1	46	220	100	39	370	100	5.7	17	100
Desethyl-terbuthylazine	1	97	470	100	25	150	100	8.3	87	100
Thiacloprid	2	4.9	26	80	21	700	60	<LOQ	4.2	40
Thiamethoxam	5	<LOQ	5.6	20	7.4	98	40	15	92	20
Triadimenol	20	<LOQ	23	20	<LOQ	59	40	<LOQ	<LOQ	0

Notes.

^aTime-weighted mean value of the concentration of the composite samples

^bMaximum value of the concentration in each composite sample

^cESA, ethanesulfonic acid

^dOA, oxalic acid

^eDCPMU, N-(3,4-dichlorophenyl)-N-methylurea)