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River water quality is strongly influenced by two factors, namely natural factors and human factors. Naturalfactors that affect the condition of the river such as heavy rain that can overflow and become cloudy, while factorsderived from humans such as waste disposal originating from industry, agriculture and cosmetics . These variousfactors can reduce river water quality, so it is necessary to analyze with various water testing parameters such aschemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solids (TSS), fat oil, heavymetals, and others. For this reason, the analysis was delivered for monitoring the Mentaya River in the EastKotawaringin with test parameters, namely COD based on SNI 6989.73-2009 using the titrimetric method andTSS based on SNI 06-6989.3-2004 by the gravimetric method.
Chemical Oxygen Demand (COD) is the amount of oxygen needed to decompose all organic matter contained inwater which is intentionally decomposed chemically by using potassium bicarbonate as strong oxidizer under acidicand hot conditions with a silver sulfate catalyst, so all kinds of organic materials which are easily decomposed orcomplex and difficult to decompose will be oxidized . In addition to carrying out the COD test to find out thewater level, a TSS test can also be carried out. The TSS in the water is in the form of organic and inorganic materialswhich can be filtered with 0.45 μm porous millipore paper River water with high COD and TSS values cannot be used as drinking water or household needs. It is necessaryto analyze the level of both parameters to determine the quality of the Mentaya River. However, before the methodis needed to be verified before being carried out.
Verification of this method is carried out by following the qualitymanagement system of the Indonesian National Standard which requires testing laboratories to analyze materialsusing valid measurement methods to obtain valid testing data . Method verification is an act of research on certainparameters based on laboratory experiments, to prove that the method meets the requirements for its use . Theparameters tested in the verification method for determining the COD and TSS levels were precision, accuracy, anduncertainty measurement.
Precision was done to determine the closeness or compatibility between the test resultswith one another in a series of tests , meanwhile, accuracy was a measure that showed the degree of closeness ofthe results of analysts with the actual levels of the analyte . Verification of this method is carried out usingmaterials traced to international units using Certificate Reference Materials (CRM).
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