Scientific Investigations Report 2005-5115 Table 8

Method of Analysis at the U.S. Geological Survey California Water Science Center, Sacramento Laboratory – Determination of Haloacetic Acid Formation Potential, Method Validation, and Quality-Control Practices

Barbara C. Zazzi, Kathryn L. Crepeau, Miranda S. Fram and Brian A. Bergamaschi

Sequence of blanks, calibration standards, quality-control standards, and unknown samples analyzed during one run of the gas chromatograph.

[MTBE, methyl tert-butyl ether; Std, standard; QCS, quality-control sample; µg/L, micrograms per liter; HAA, haloacetic acid; CCV, continuing calibration verification]

Vial number	Sample ID	Sample description
1	MTBE	Instrument blank
2	Std 1	Calibration standards
3	Std 2	Calibration standards
4	Std 3	Calibration standards
5	Std 4	Calibration standards
6	Std 5	Calibration standards
7	Std 6	Calibration standards
8	Std 7	Calibration standards
9	Std 8	Calibration standards
10	Std 9	Calibration standards

11	MTBE	Instrument blank
12	Extraction blank	Organic-free water carried through all extraction steps
13	Full procedural blank	Organic-free water carried through full procedure
14	QCS5	Quality-control standard containing 5 µg/L of each HAA
15	QCS50	Quality-control standard containing 50 µg/L of each HAA
16	MTBE	Instrument blank
17	Sample 1 diluted	Sample used for matrix spike, sample is diluted 1:5 with organic-free water
18	Matrix spike	1:4 diluted sample 1 spiked with std 5 concentrations of HAA
19	Matrix spike duplicate	1:4 diluted sample 1 spiked with std 5 concentrations of HAA
20	Sample 2	Sample

21	Sample 3	Sample
22	Sample 4	Sample
23	Sample 5	Sample
24	Sample 6	Sample
25	Sample 7	Sample
26	Sample 8	Sample
27	Sample 9	Sample
28	Sample 10	Sample
29	MTBE	Instrument blank
30	CCV – std 4	Continuing calibration verification-std level 4

31	CCV – std 5	Continuing calibration verification-std level 5
32	MTBE	Instrument
33	Sample 1	Same samples as in vials 17−29, but diluted 1:5 with organic-free water prior to extraction
34	Sample 2 diluted	Diluted sample
35	Sample 3 diluted	Diluted sample
36	Sample 4 diluted	Diluted sample
37	Sample 5 diluted	Diluted sample
38	Sample 6 diluted	Diluted sample
39	Sample 7 diluted	Diluted sample
40	Sample 8 diluted	Diluted sample

41	Sample 9 diluted	Diluted sample
42	Sample 10 diluted	Diluted sample
43	MTBE	Instrument blank
44	CCV – std 4	Continuing calibration verification–std level 4
45	CCV – std 5	Continuing calibration verification–std level 5
46	MTBE	Instrument blank

Vial number

Sample ID

Sample description

MTBE

Instrument blank

Std 1

Calibration standards

Std 2

Calibration standards

Std 3

Calibration standards

Std 4

Calibration standards

Std 5

Calibration standards

Std 6

Calibration standards

Std 7

Calibration standards

Std 8

Calibration standards

Std 9

Calibration standards

MTBE

Instrument blank

Extraction blank

Organic-free water carried through all extraction steps

Full procedural blank

Organic-free water carried through full procedure

QCS5

Quality-control standard containing 5 µg/L of each HAA

QCS50

Quality-control standard containing 50 µg/L of each HAA

MTBE

Instrument blank

Sample 1 diluted

Sample used for matrix spike, sample is diluted 1:5 with organic-free water

Matrix spike

1:4 diluted sample 1 spiked with std 5 concentrations of HAA

Matrix spike duplicate

1:4 diluted sample 1 spiked with std 5 concentrations of HAA

Sample 2

Sample

Sample 3

Sample

Sample 4

Sample

Sample 5

Sample

Sample 6

Sample

Sample 7

Sample

Sample 8

Sample

Sample 9

Sample

Sample 10

Sample

MTBE

Instrument blank

CCV – std 4

Continuing calibration verification-std level 4

CCV – std 5

Continuing calibration verification-std level 5

MTBE

Instrument

Sample 1

Same samples as in vials 17−29, but diluted 1:5 with organic-free water prior to extraction

Sample 2 diluted

Diluted sample

Sample 3 diluted

Diluted sample

Sample 4 diluted

Diluted sample

Sample 5 diluted

Diluted sample

Sample 6 diluted

Diluted sample

Sample 7 diluted

Diluted sample

Sample 8 diluted

Diluted sample

Sample 9 diluted

Diluted sample

Sample 10 diluted

Diluted sample

MTBE

Instrument blank

CCV – std 4

Continuing calibration verification–std level 4

CCV – std 5

Continuing calibration verification–std level 5

MTBE

Instrument blank