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CHNO Combustion Services

Introduction

Carbon, Hydrogen, Nitrogen are determined using a 2400 Perkin-Elmer CHN Analyzer. This analyzer uses combustion to convert the sample elements to simple gasses, i.e. CO2, H2O, & N2. Upon entering the analyzer, the sample is combusted in pure oxygen environment at temperatures in the range of 1200-1500 F. The product gasses are separated under steady state conditions, and measured as a function of thermal conductivity.

Oxygen Analysis by Combustion

The Perkin-Elmer 2400 Elemental Analyzer is fitted with an oxygen accessory kit to determine oxygen in organic materials. The analyzer uses pyrolysis to convert the oxygen to carbon monoxide. The carbon monoxide is then separated from the other pyrolozates under steady state conditions, and measured as a function of thermal conductivity.

Elemental, Organic, & Total Carbon by Thermal Optical Analysis

As with other current organic carbon and elemental carbon (OC/EC) procedures, Thermal-Optical analysis is method-defined. This unit has been designed to specifically address the problems observed in other methods by assigning carbon to either the organic or the elemental fraction. By careful system control and continuous monitoring of the optical absorbance of the sample during analysis, this method is able to both prevent any undesired oxidation of original elemental carbon and make corrections for the inevitable generation of carbon char produced by the pyrolitic conversion of organics into elemental carbon. The OC/EC instrument utilized by EAI is used to analyze both bulk samples, and aerosol particles collected on quartz or glass fiber filters. The accuracy of this method for measuring total carbon content can be ascertained by analyzing a known quantity of carbon, a function that is performed

on a regular basis as part of the quality assurance program. Known quantities of sucrose and/or organic compounds are applied to blank quartz fiber filters, analyzed, and the OC/EC results are compared to the known presence of OC and EC. Relative standard deviations are less than 5%. The lower detection limit of this method is on the order of 0.2g/cm2 for both OC & EC.

 

* Quantity discounts available, please call to discuss application specifics and pricing guidelines

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Services

CHNO Combustion Services

Services

CHNO Combustion Services

Services

CHNO Combustion Services

CHNO Combustion Services