Environmental analysis uses analytical chemistry techniques to determine the impact of contaminants on environmental conditions. Whether soil or water samples, Analytik Jena can offer you analysis solutions that are not only at the forefront of technology, but also simplify your everyday laboratory operations. Obtain better results with less effort and discover solutions that allow you to detect toxic elements and sum parameters such as TOC, TNb and AOX.
In this eBook, you'll learn about:
- Methods for determining TOC/TNb in municipal sewage plants, solid waste, raw and drinking water, and agricultural soil, dried manure, and sediments
- How to find the right TOC analyzer for your needs
- How to improve your throughput and simplify your environmental analysis with new technology
Download the free Environmental Analysis Resource Guide now.
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Environmental Analysis
Resource Guide
TOC/TNb Determination in Municipal Sewage Plants
Determination of TOC in Agricultural Soil, Dried Manure and Sediments
Determination of TOC in Solid Waste
TOC Determination in Raw and Drinking Water
Environmental Analysis Resource Guide
Introduction
Whether soil or water samples, Analytik Jena can offer you analysis solutions that are not only at the forefront of technology, but also simplify your everyday laboratory operations. Obtain better results with less effort and discover solutions that allow you to detect toxic elements and sum parameters such as TOC, TNb and AOX.
Environmental Analysis Resource Guide
TOC/TNb Determination in Municipal Sewage Plants
Introduction
In wastewater treatment plants, the organic and nitrogen load have to be measured in the untreated inflow, the pretreated effluent, and the final effluent after the completed treatment process. In many cases, the chemical oxygen demand (COD) and TN contents are measured with separate methods. This is a labor- and time-
Challenge
Reproducible and reliable determination of TOC and TNb contents in samples with high particle loads/wastewater.
Solution
Fully automated and simultaneous TOC/TNb measurement using direct injection technology and catalytic high-temperature combustion, which allow optimum particle handling and a minimized risk of carry-over.
consuming process often associated with the formation of chromium-VI-contaminated waste. Through correlation studies, an empirical conversion factor for TOC to COD conversion can be established. Hence, a fully automated analytical process for TOC/
TNb determination according to EN 1484 and EN 12260 can be applied to save resources and time.
In order to guarantee accurate and efficient analysis, it is recommendable to use a catalytic high-temperature combustion TOC analyzer for simultaneous determination of NPOC and TN from one single injection. According to these standards, TOC isb defined as the sum of dissolved and particle-bound organic carbon compounds. Thus, the challenge is to assure a representative sample transfer, including all the particles, into the combustion system and at the same time to guarantee a complete oxidation of both, difficult-to-oxidize substances and particle-bound organics. This requires an effective sample homogenization on the autosampler rack and a sample introduction technique that ensures no particles get lost on the way to the combustion tube or cause any blockages, which may lead to system downtime or to extended wear and tear on sensitive Teflon parts inside the dosing system. A combustion system capable of providing sufficiently high furnace temperatures to assure a complete sample digestion is required as well. This application note describes a method using the
multi N/C® 2100S TOC/TNb analyzer. The samples were measured at a customer’s site (wastewater treatment plant) in Germany using a direct injection system for optimized
particle handling.
Materials and Methods
Samples and Reagents
Wastewater samples were taken from the inflow into the sewage plant as well as intermediate treatment stages
2 M HCl was used for automatic sample acidification to a pH < 2
Sample Preparation
The samples were stored in a refrigerator at 4 °C until analysis and then transferred into suitable autosampler vials. The wastewater samples were analyzed in direct mode applying an NPOC/TNb method. The samples were adjusted to
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