Determination of trace perchlorate in water: a simplified method for the identification of potential interferences

Environmental Sciences Europe

Table 3 Data for the verification of the perchlorate RL of 1.5 µg/L (average of three replicates)

Sample	Matrix	Treatment	TDA	Cond	Perchlorate
Sample	Matrix	Treatment	(mg/L)	(µS/cm)	Mean (µg/L)	s _x (µg/L)
1	Ground water	untreated	168	459	1.59	0.0115
1	Ground water	SPE treated	168	459	1.59	0.1340
2	Drinking water	untreated	113	713	1.46	0.0100
2	Drinking water	SPE treated	113	713	1.67	0.0681
3	Drinking water	untreated	45	257	1.92	0.0569
3	Drinking water	SPE treated	45	257	1.62	0.0321
4	Drinking water	untreated	110	705	1.65	0.0200
4	Drinking water	SPE treated	110	705	1.58	0.0917
5	Surface water	untreated	55	311	1.92	0.0800
5	Surface water	SPE treated	55	311	1.71	0.0950

TDA, Total dissolved anions; Cond, Conductivity; s _x, repeatability standard deviation