|
|||||
|
|
Calibration Curve with Improved Limit of Detection for Cadmium in Soil: An Approach to Minimize the Matrix Effect in Laser-Induced Breakdown Spectroscopic Analysis |
|
| Authors: | Shiwani Pandhija Nilesh K. Rai Ashok K. Pathak A. K. Choudhary |
| Affiliation: | 1. Laser Spectroscopy Research Laboratory, Department of Physics , University of Allahabad , Allahabad , India;2. Laser Spectroscopy Research Laboratory, Department of Physics , University of Allahabad , Allahabad , India;3. Inorganic and Physical Chemistry , Indian Institute of Science (IISc) , Banglore , India;4. Department of Physics , Ewing Christian College , Allahabad , India;5. Institute Instrumentation Center , Indian Institute of Technology , Roorkee , India |
| Abstract: | The present article describes a working or combined calibration curve in laser-induced breakdown spectroscopic analysis, which is the cumulative result of the calibration curves obtained from neutral and singly ionized atomic emission spectral lines. This working calibration curve reduces the effect of change in matrix between different zone soils and certified soil samples because it includes both the species' (neutral and singly ionized) concentration of the element of interest. The limit of detection using a working calibration curve is found better as compared to its constituent calibration curves (i.e., individual calibration curves). The quantitative results obtained using the working calibration curve is in better agreement with the result of inductively coupled plasma–atomic emission spectroscopy as compared to the result obtained using its constituent calibration curves. |
| Keywords: | calibration curve laser-induced breakdown spectroscopy (LIBS) limit of detection matrix effect soil |