Introduction - Determination of Anions in Natural and Treated Waters - page 37

Conductivity detector
Features include:

• high-sensitivity detection of inorganic anions, amines, surfactants, organic acids, Group
I and II metals, oxy-metal ions and metal cyanide complexes (used in conjunction with
MMS);
• bipolar-pulsed excitation eliminates the non-linear response with concentration found in
analogue detectors;
• microcomputer-controlled temperature compensation minimises the baseline drift with
changes in room temperature.

UVVis detector
Important factors are:

• high-sensitivity detection of amino acids, metals, silica, chelating agents, and other
ultraviolet absorbing compounds using either post-column reagent addition or direct
detection;
• non-metallic cell design eliminates corrosion problems;
• filter-based detection with selectable filters from 214 to 800nm;
• proprietary dual wavelength detection for ninhydrin-detectable amino acids and PAR-
detectable transition metals.

Optional detectors
In addition to the detectors show, Dionex also offer visible fluorescence and pulsed
amperometric detectors for use with the series 4000i. Dionex also supply a wide range of
alternative instruments, eg single channel (2010i) and dual channel (2020i). The latter can
be upgraded to an automated system by adding the Autoion 100 or Autoion 300
controller to control two independent ion chromatograph systems. They also supply a
2000i series equipped with conductivity pulsed amperometric, ultraviolet-visible and
refractometric detectors.

Applications of ion chromatography

Non
saline
waters:

pyrophosphate, selenate, selenite, silicate, sulphide, sulphite, thiocyanate, thiosulphate,
hypochlorite, chlorite, hypophosphite, iodide, metal cyanide com-plexes, nitrate, nitrite,
phosphate, arsenate, arsenite, bicarbonate, borate, borofluoride, bromate, bromide,
carbonate, chlorate, chloride, chromate, dichromate, free cyanide, total cyanide,
dithionite, fluoride.
Also, protocatechaute, propionate, pyruvate, quinate, resorcylate, salicylate, succinate,
sulphon-ates, tartrate, transaconitate, trifluoroacetate, valerate, gallate, gluconate,
gluconurate, glycollate, glyoxylate, hexane sulphonate, hydroxybenzoate, isobutyrate,
isocitrate, α-hydroxybutyrate, isobutyrate, isocitrate, α-ketoglutarate, lactate, malate,
malonate, mono-chloroacetate, octane sulphate, octane sulphonate, oxalacetate, oxalate,
phthalate, anisate, carlioxylates, chlorobenzoate, cis aconitate, citrate, decane sulphon-
ate, dichloroacetates, dimethyl benzoate, decane sulphate, decane sulphonate, formate,
fumarate and galactonurate.