Total organic carbon (TOC) analysis measures organic contamination levels, and is thus an important indicator of general water quality. TOC is an effective monitoring parameter because it responds to all types of organic carbon, either dissolved or suspended in water, including compounds without a chromophore. Both benchtop systems for highly accurate laboratory analysis of spot samples collected at designated intervals and on-line analyzers that monitor influent and effluent process water streams in real time are available. When used in tandem, these two analyzers provide the most comprehensive approach to the monitoring and optimization of the water treatment process.
Community water systems that serve large populations generally rely on surface water such as rivers, lakes and reservoirs as their "raw" water intake source, and the quality of the raw water from these sources determines the drinking water treatment process that is employed. No matter the process, TOC analysis is critical for the accurate monitoring of organic carbon levels in compliance with water treatment methods.
In the drinking water treatment process, raw source water is pumped through a screen to remove large debris. Potassium permanganate (KMnO4), a substitute preoxidant to chlorine, is a strong agent that may be added to oxidize organic matter and is used to control total organic trihalomethanes (TTHMs). It also imparts undesirable flavors, odors and colors. After the addition of KMnO4, the water is clarified by flocculation and sedimentation. Alum, iron salts or organic polyelectrolyte polymers are added to coagulate small particles into larger ones that settle out as sediment. The clear water is then filtered through a bed of sand and gravel to remove remaining particles and natural organic matter.
The Aurora 1030C TOC Analyzer processes aqueous samples for analysis of the total organic carbon (TOC), total inorganic carbon (TIC), and non-purgeable organic carbon (NPOC) content of the samples. Samples containing 100 ppb to 30,000 ppm of organic carbon can be analyzed. The Aurora 1030C supports USEPA-approved methods, Standard Methods, ASTM, DIN/ISO/CEN, and EU Methods. Depending upon the protocol employed, up to 300 samples per 24-hour period can be analyzed, and in excess of 100,000 samples per year.
The 1088 Rotary Autosampler is specifically designed to operate with the Aurora 1030W TOC analyzer or Aurora 1030C TOC analyzer. The 1088 autosampler aspirates liquid samples from vials and transfers each sample aliquot to an Aurora 1030 TOC analyzer for analysis. A removable 88-position autosampler tray loads the sample vials for fully automated, unattended operation.
The 1030S Solids Module is a sample preparation module enabling the analysis of the total organic carbon (TOC) or total carbon (TC) content in solid materials. The 1030S module is operated in conjunction with an Aurora 1030W or 1030C TOC analyzer.
The OI Analytical 9210p On-line Total Organic Carbon (TOC) Analyzer is designed to continuously monitor TOC levels in process water streams. The 9210p uses proven heated persulfate oxidation technology for accurate, dependable operation and regulatory compliance. Virtually all organic compounds dissolved in water can be oxidized with high efficiency by this technique.