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1 <br /> • DEFINITIONS OF ANALYTICAL METHODS <br /> i <br /> Chromatograph- A device that separates and detects vanous components in a sample. <br /> iColorimetric Method- In a colonmetrnc method, chemicals are added that form a color when <br /> they react with the compound to be measured The amount of color is relative to the compound's <br /> iconcentration. The concentration is deternuned by comparing the color to a standard or by <br /> reading in a spectrophotometer. Field-ready spectrophotometers with build-m calibration curves <br /> iare available <br /> HACH'9- A company that specializes in providing field kits for monitoring a wide range of <br /> ichemicals in aquatic samples (1-800-227-4224). <br /> Inductively Coupled Plasma (ICP) - ICP is an analytical method for metals. The sample is <br />' sprayed into a chamber kept at about 6000°C Each metal emits a specific spectrum The <br /> intensity of the emission is relative to the concentration of the specific metal. The concentration <br /> of multiple metals can be determined at the same time <br />' Titration- In titration, a color indicator is added to the sample A second solution is then slowly <br /> added to the sample. The volume of the second solution required to cause a color change is <br /> lieproportional to the chemical's concentration <br /> 1 <br /> I <br /> • <br /> 19 <br />