Water quality. Determination of organochlorine pesticides (OCP) in whole water samples. Method using solid phase extraction (SPE) with SPE-disks combined with gas chromatography mass spectrometry (GC-MS)

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This European Standard specifies a method for the determination of selected organochlorine pesticides (OCP) (see Table 1), in water samples. The method uses solid-phase extraction with SPE-disks followed by gas chromatography-mass spectrometry (GC-MS). It is applicable to the analysis of OCPs in surface water containing suspended particulate matter (SPM) up to 500 mg/l (whole water samples), drinking water and groundwater. The lower limit of the working range depends on the matrix, on the specific compound to be analyzed and on the sensitivity of the mass spectrometric detection unit. For compounds listed in Table 1 the limit of determination (LOQ) is at least 30 % of the corresponding AA-EQS value (0,000 15 µg/l to 0,1 µg/l) according to the requirements of the European Quality Standards Directive (Directive 2008/105/EC) for both inland surface waters and other surface waters.

This method may be used for the analysis of other OCPs not listed in Table 1 or other types of water. However, it is important to verify its applicability before use.

Table 1 — Organochlorine pesticides (OCP) determined by this method

Substance	Molecular formula	Molar mass g/mol	EC Number ^{^a}	CAS RN ^{^b}
Alachlor	C₁₄H₂₀ClNO₂	269,77	240–110–8	15972–60–8
Cyclodiene pesticides:
Aldrin	C₁₂H₈Cl₆	364,91	206–215–8	309–00–2
Dieldrin Endrin Isodrin	C₁₂H₈Cl₆O C₁₂H₈Cl₆O C₁₂H₈Cl₆	380,91 380,91 364,91	200–484–5 200–775–7 207–366–2	60–57–1 72–20–8 465–73–6
DDT-total:
op´-DDT	C₁₄H₉Cl₅	354,49	212–332–5	789–02–6
pp´-DDT pp´-DDD pp´-DDE	C₁₄H₉Cl₅ C₁₄H₉Cl₄ C₁₄H₉Cl₄	354,49 320,04 318,03	200–024–3 200–783–0 200–784–6	50–29–3 72–54–8 72–55–9
Hexachlorobenzene (HCB)	C₆Cl₆	284,80	204–273–9	118–74–1
Hexachlorobutadiene (HCBD)	C₄Cl₆	260,76	201–765–5	87–68–3
Hexachlorocyclohexane ^{^c}:
alpha-HCH	C₆H₆Cl₆	290,83	206–270–8	319–84–6
beta-HCH delta-HCH gamma-HCH	C₆H₆Cl₆ C₆H₆Cl₆ C₆H₆Cl₆	290,83 290,83 290,83	206–271–3 206–272–9 200–401–2	319–85–7 319–86–8 58–89–9
Pentachlorobenzene	C₆HCl₅	250,34	210–172–0	608–93–5
Trichlorobenzene ^{^c}:
1,2,3-TCB	C₆H₃Cl₃	181,45	201–757–1	87–61–6
1,2,4-TCB 1,3,5-TCB	C₆H₃Cl₃ C₆H₃Cl₃	181,45 181,45	204–428–0 203–608–6	120–82–1 108–70–3
Endosulfan ^{^c}:
Endosulfan-I (alpha)	C₉H₆Cl₆O₃S	406,93	–	959–98–8
Endosulfan-II (beta)	C₉H₆Cl₆O₃S	406,93	–	33213–65–9

^a EC Number: European inventory of existing commercial substances (EINECS) or European list of notified chemical substances (ELINCS).

^b CAS RN: Chemical Abstracts Service Registry Number.

^c Mixture of isomers.