High-Temperature Combustion TOC Analyzer for Wastewater

What is the High-Temperature Combustion TOC Analyzer for Wastewater?

A laboratory TOC analyzer that catalytically combusts wastewater samples at up to 900 °C and detects CO2 by NDIR. It is the right choice for effluents with particulates, high salinity or high organic loading that would challenge UV-based oxidation.

Overview

This variant uses a platinum-catalyzed combustion furnace operating between 680 and 900 °C with a heated catalyst tube, a halogen scrubber and an NDIR CO2 detector. A syringe or valve-based injector delivers up to 500 µL, and an autosampler with a stirring function keeps suspended solids homogeneous. The wide measuring range, typically 4 µg/L to 30,000 mg/L with automatic dilution, covers raw influent through to polished effluent on one instrument. Combustion completely oxidizes particulates, humic substances, surfactants and refractory polymers, so recovery is high in difficult matrices. Salt-tolerant furnace designs and replaceable catalyst and scrubber cartridges limit downtime on brine or tannery samples. Both NPOC and TC-IC modes are available, and optional total nitrogen detection extends the platform to discharge reporting. The trade-off is higher consumables use, including carrier gas, catalyst and combustion tubes, and a longer warm-up than UV systems.

How does it work?

A TOC analyzer converts all organic carbon in a water sample to CO2 and quantifies the gas. Two oxidation routes dominate. High-temperature catalytic combustion injects the sample into a furnace at 680–900 °C containing a platinum or similar catalyst, which also handles particulates and difficult compounds. UV-persulfate oxidation adds sodium persulfate and irradiates the sample with UV at 185 and 254 nm to generate hydroxyl radicals. Inorganic carbon is removed first by acidification and sparging, or measured separately to give TOC by difference. The CO2 is carried by purified air or oxygen to a non-dispersive infrared detector, or measured by membrane conductometry in low-level systems. Peak area is integrated and converted to concentration using a multi-point calibration against potassium hydrogen phthalate standards.

What are the key features?

• Catalytic combustion furnace up to 900 °C oxidizes particulates and refractory organics fully
• Automatic dilution extends range to 30,000 mg/L without manual sample preparation
• Stirred autosampler with 24 to 93 positions keeps suspended solids homogeneous
• Salt-tolerant furnace and replaceable catalyst cartridge reduce downtime on saline samples
• Selectable NPOC and TC-IC modes with optional total nitrogen detector
• Software with audit trail, user levels and automatic calibration curve generation

What are the technical specifications?

A typical high-temperature combustion toc analyzer for wastewater configuration offers oxidation method of Catalytic combustion, 680–900 °C, measuring range (TOC) of 4 µg/L–30,000 mg/L, detector of NDIR CO2 detector, detection limit of 4 µg/L (typical), repeatability of CV ≤ 1.5% and injection volume of 10–500 µL. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The High-Temperature Combustion TOC Analyzer for Wastewater is used in industrial wastewater discharge compliance, municipal wastewater treatment plant influent and effluent, landfill leachate characterization and petrochemical and chemical process effluent. Across the wider TOC Analyzers class, laboratories also deploy it for drinking water treatment monitoring, wastewater discharge compliance and surface water and groundwater surveys.

Which standards and certifications apply?

Relevant standards and methods include ISO 8245, ASTM D4839, ASTM D5173, ASTM D5904, USP <643>, Ph. Eur. 2.2.44, HJ 501 and IEC 61010-1. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install the analyzer on a stable bench with clean, dry carrier gas at 99.99% purity or a zero-air generator, and provide ventilation for exhaust. Calibrate at least monthly with potassium hydrogen phthalate and verify with sodium carbonate and a blank each run. Keep glassware organic-free and use ultrapure water blanks, since ambient organics cause high blanks. Replace combustion catalyst, halogen scrubbers and persulfate reagent on the schedule stated by the manufacturer. For regulated laboratories, confirm software audit trails and user access levels, and run system suitability with sucrose and benzoquinone to check oxidation efficiency where USP <643> applies.

How do I select the right High-Temperature Combustion TOC Analyzer for Wastewater?

Select this variant when samples contain solids, high chloride or organic loads above 100 mg/L, or when the method requires complete oxidation of refractory compounds. Choose UV-persulfate instead for clean water below 20 mg/L. In an RFQ, specify expected TOC range, maximum chloride content, particle size, autosampler positions, whether TN detection is needed, and the reference method such as ISO 8245 or HJ 501.

How does it compare with other TOC Analyzers variants?

The decisive parameters are sample matrix, measuring range and operating mode. Wastewater and effluents with particulates, high salt or high carbon load call for high-temperature combustion with a robust injection system and dilution capability. Drinking water and cleaner surface water, typically below 20 mg/L, are well served by UV-persulfate or low-temperature oxidation with sub-0.1 mg/L resolution. Semiconductor and pharmaceutical purified water need online ppb-level sensors with conductivity-based detection. Decide whether you need laboratory batch analysis with an autosampler or continuous online data. If nitrogen loading matters for discharge permits, a combined TOC-TN configuration saves a second instrument. Also check the method you must follow, such as ISO 8245 or USP <643>, and the consumables cost of gases, catalyst and reagents.