Table 1.

Validation of the sample clean-up procedure of AMPA, IDMP and HEDP

Phosphonate	Condition	LOD mg L−1	LLOQ mg L−1	PSD-	rel. PSD %	Slope-	Recovery %
AMPA (UPW)	Without CER	0.241	1.262	0.098	1.395	0.1584 ± 0.0028	-
	CER	2.237	3.417	0.192	3.197	0.0590 ± 0.0025	37.2 ± 1.59
	CER 100	3.588	4.704	0.093	1.161	0.0864 ± 0.0036	54.5 ± 2.28
	CER 1000	0.619	1.941	0.132	1.917	0.0516 ± 0.0040	32.6 ± 2.55
AMPA (TW)	Without CER	0.530	2.943	0.122	2.041	0.0539 ± 0.0019	34.0 ± 1.18
	CER	0.864	2.392	0.166	2.376	0.0629 ± 0.0020	39.7 ± 1.27
	CER 100	0.476	2.330	0.154	2.372	0.0768 ± 0.0032	48.5 ± 2.03
IDMP (UPW)	CER 1000	1.072	1.926	0.100	1.424	0.0841 ± 0.0025	53.1 ± 1.59
	No CER	0.618	1.643	0.133	2.042	0.9002 ± 0.0214	-
	CER	0.517	0.854	0.151	2.329	0.4410 ± 0.0300	49.0 ± 3.34
	CER 100	1.767	2.633	0.125	1.786	0.4929 ± 0.0216	54.8 ± 2.40
	CER 1000	1.748	2.624	0.089	1.271	0.5254 ± 0.0153	58.4 ± 1.70
IDMP (TW)	CER	1.612	2.328	0.058	0.860	0.5727 ± 0.0175	63.6 ± 1.95
	CER 100	1.966	2.601	0.123	1.885	0.5536 ± 0.0233	61.5 ± 2.59
	CER 1000	1.603	2.157	0.065	0.924	0.5141 ± 0.0208	57.1 ± 2.31
HEDP (UPW)	No CER	4.971	5.192	0.176	2.353	0.7207 ± 0.0174	-
	CER	4.944	5.237	0.148	1.639	0.7033 ± 0.0168	97.6 ± 2.33
	CER 100	4.500	4.705	0.107	1.193	0.4538 ± 0.0194	63.5 ± 2.70
	CER 1000	3.284	3.858	0.100	1.250	0.3508 ± 0.0175	48.7 ± 2.42
HEDP (TW)	CER	3.233	4.028	0.122	1.521	0.5192 ± 0.0210	72.0 ± 2.91
	CER 100	3.904	3.450	0.327	4.085	0.3737 ± 0.0156	52.1 ± 2.17
	CER 1000	1.142	2.728	0.228	3.257	0.2333 ± 0.0144	31.4 ± 3.13