Multianion analysis, applications of ion chromatography - Determination of Anions in Natural and Treated Waters - page 618

ClO 4 -

19.6 N 2 195 B

S 2

21.2 Y 0.4 1 200 D

SO 4 2-

22.8 N 2 195 A

SeO 4 2-

27.2 Y 15 2 195 A

a N, not UV active. b Y., UV active. c 2, after suppressor. d 1, before suppressor. e 100µL injection,
peak height 2×noise level
Source: Reproduced with permission from the American Chemical Society [9]

phosphate and sulphate do not show appreciable absorption above 190nm. Chloride
absorbs weakly in the ultraviolet region below 200nm. Note that non-absorbing anions
are sometimes observed by the ultraviolet detector as negative peaks, as is shown in Fig.
12.1(b) for phosphate. Table 12.1 contains a more extensive list of ultraviolet active
anions and also lists the detection limits for many of the anions. Detection

Fig. 12.2 Separation of iodate and bromate by ion chromatography ultraviolet
detector (- - -) at 195nm, position 2; conductivity detector (--); peak
1, 0.5mg L −1 IO 3 − ; peak 2, 0.8mg L−1 BrO3−
Source: Reproduced with permission from the American Chemical