Ion Chromatography vs. Flow Chemistry for Anion Analysis, Nutrition, and Trace Elements Sulfur Analyzer Indonesia

introduction

Environmental Ion Chromatography (IC) has traditionally been applied to the analysis of anions in Drinking Water. Recently IC has received acceptance for wastewater analysis. Common anions analyzed by IC are: F, Cl, NO2, Br, NO3, HPO4, and SO4. We cannot argue that IC is a superior method compared to flow for routine determination of Chloride and Sulphate in many relatively consistent or "clean" matrix samples such as drinking water, groundwater with low solids, and certain industrial releases. With additional columns and detectors, IC can also be used for analysis of Ammonia, Cations, and trace metals such as Chromium VI.

The detection limit for IC is around 0.1 mg / l for clean samples such as drinking water. After the sample begins to contain high dissolved solids, dissolved organics, or excess anions in relation to others the detection limits begin to suffer. This is caused by dilution needed to eliminate interference.

Disorders

Common disorders with IC rarely cause problems with flow chemistry methods. Example:

Accurate analysis of low levels of Chloride in SWEX leachate by IC is prevented by the high dilution required to dilute Copper, Aluminum and Iron Sulphate to a level that will not destroy the IC column. The chemical flow method, however, is able to analyze the solution directly without dilution.

High Chloride concentration interferes with the determination of trace amounts of Nitrite.

Chloride does not interfere with the flow method.

Samples for Nitrate cannot be maintained because, even if adjusted to neutral before analysis, high sulfate levels require sample dilution. Because preserved samples cannot be analyzed by IC, Nitrate sulfur analyzer indonesia samples must be tested within 48 hours. Sulfuric acid (added at the appropriate level) does not interfere with the flow method.

Fluoride is not recommended for determination by IC at levels below about 1.0 mg / l. Although there are adjustments to overcome this problem, they require deviations from normal procedures.

The orthophosphate method by IC is very pH specific and is disturbed by interference from metals. The pure detection limit of 0.1 mg / l suffers from the required sample dilution. Total P cannot be determined. The flow chemistry method for P is very sensitive and rarely has interference. Chemical flow can determine all P forms in solution.

Low level sulfate is difficult to determine in high chloride brine solutions because dilution is needed to bring the response to the scale. If the sample is analyzed without dilution, the high salt content usually causes a shift in the retention time which causes the sulfate to be identified by the data system as phosphate.

IC is a very good method for CrVI, but this analysis requires separate columns and detectors than those used for anions. Flow chemistry methods use the same type of detector as all other color methods.

Cyanide can be determined by IC using the same CrVI column, however, the determination of CN requires another detector.

Ammonia can be determined by IC, but separated by using different columns, and various reagents as anions.