Multianion analysis, applications of ion chromatography - Determination of Anions in Natural and Treated Waters - page 626

18 852 860 20.0 14.7

22 870 880 19.7 14.5

26 852 920 20.0 13.5

30 852 960 20.0 13.5

Mean 855.6 896.0 19.9 14.1

S.D. 8.05 43.4 0.14 0.59

R.S.D. 0.9% 4.8% 0.7% 4.2%

NO 3 (250mm) (mg
L −1 )

NO 3 (500mm) (mg
L −1 )

SO, (250mm) (mg
L −1 )

SO, (500mm) (mg
L −1 )

<0.02 <0.05 27.3 25.0

<0.02 <0.05 27.5 25.0

<0.02 <0.05 27.3 24.2

<0.02 <0.05 27.3 24.6

<0.02 <0.05 27.5 24.2

0.02 0.05 27.4 24.6

- - 0.11 0.4

- - 0.5% 1.6%

Source: Reproduced with permission from Elsevier Science [10]

pellicular anion exchanger with a capacity of about 12µeq of quaternary ammonium
groups per gram of dry material). Suppressor column resin Ag-5OW-X12 (>400 mesh:
Bio-Rad Laboratories). This is a strong cation exchanger prepared from a styrene-divinyl-
benzene copolymer with 12% cross links. It has a capacity of 5meq of SO 3 H groups per
gram of dry resin.
Ion chromatographic apparatus, Fig. 12.8, is equipped with a reciprocating piston
pump (Kipp Analytica, Emmen, The Netherlands). The pulse dampener system consists
of an Orlita (Giessen/Lahn, West Germany) pulse dampener and a stainless steel
resistance capillary (length 3m, id 0.25mm). The stainless steel eluent filter (Chrompack,
Middelburg, The Netherlands) has a pore diameter of 2µm. The six port sample injection
valve and the eight port valve were supplied by Valco (Houston, Texas). The former is
equipped with a 60µL sample loop. Both are actuated pneumatically. The home made
conductivity cell consists of two platinum electrodes in a perspex housing and has a cell
volume of 6µL. The digital conductivity detector has been described elsewhere [12].