Comparison with Other Elemental Analysis

Gas Extraction method is the best method for Carbon, Sulfur, Oxygen, Nitrogen and Hydrogen quantitative analysis because of the high sensitivity without influence of coexisting gases, wide concentration range, good repeatability and high-speed analysis.


Analysis method	C	S	O	N	H	Advantages	Disadvantages
ICP-OES	×	○	×	×	×	Influence of the coexisting elements is small High sensitivity	Need pre-treatment (decomposition or dissolution) Slow
Atomic Absorption	×	○	×	×	×		Need pre-treatment (decomposition or dissolution) Slow
XRF	△	△	△	△	×	Easy pre-treatment (Cut, polish or press) High speed	Influence of the coexisting elements is large Sensitivity for trace analysis insufficient
Spark OES	○	○	○	○	×	Easy pre-treatment (Cut, polish or press) High speed
*Gas Extraction*	✓	✓	✓	✓	✓	Influence of the coexisting elements is small High sensitivity (ppm) High speed High repeatability *Wide concentration range*	Detectable elements are limited to only CS/ONH

✓: Highly suitable　○:Suitable　△:Partly suitable　×:Unsuitable

Other than the Gas Extraction method, there is no technique able to provide analysis of C/S, O/N and H with such sensitivity and within few minutes.

For example:

ICP-OES can determine about 70 elements of the periodic table, but not C, O, N and H.
ED-XRF cannot measure O, N and C.
WD-XRF can measure C at % levels only.
Spark-OES instruments cannot measure H accurately and are not reaching the performance of Gas Extraction method for both low and high levels of concentration.

A limitation of the Gas Extraction method instruments is that they are not designed to handle liquid samples and cannot perform measurement of organic C, S, O, N and H. Also, such instruments are not designed to perform measurements on the field or close to process and having them in transportable laboratory lead to an expensive solution due to the need of gases and high electrical current.

Comparison with Other Elemental Analysis

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