title: Carbon determination in carbon-manganese steels under atmospheric conditions by Laser-Induced Breakdown Spectroscopy.
abstract: The most sensitive lines of carbon, used nowadays for its determination in steels by laser-induced-breakdown spectroscopy (LIBS), are at vacuum UV and, thereby, LIBS potential is significantly reduced. We suggested the use of the C I 833.51 nm line for carbon determination in low-alloy steels (c(C)~0.186-1.33 wt.%) in air. Double-pulse LIBS with the collinear scheme was performed for maximal enhancement of a carbon emission signal without substantial complication of experimental setup. Since this line is strongly broadened in laser plasma, it overlapped with the closest iron lines greatly. We implemented a PCR method for the construction of a multivariate calibration model under spectral interferences. The model provided a RMSECV = 0.045 wt.%. The predicted carbon content in the rail templet was in an agreement with the reference value obtained by a combustion analyzer within the relative error of 6%.
authors.forename: Timur A
authors.initials: TA
authors.lastname: Labutin
authors.forename: Sergey M
authors.initials: SM
authors.lastname: Zaytsev
authors.forename: Andrey M
authors.initials: AM
authors.lastname: Popov
authors.forename: Nikita B
authors.initials: NB
authors.lastname: Zorov
mesh_terms: D002138:Calibration; D002244:Carbon / Q000032:analysis*; D007477:Ions; D007834:Lasers; D008345:Manganese / Q000032:analysis*; D013057:Spectrum Analysis / Q000379:methods*; D013232:Steel / Q000737:chemistry*
chemical_list: D007477:Ions; D013232:Steel; D008345:Manganese; D002244:Carbon