Operational conditions have been previously optimized in our laboratory by using a pulse Nd:YAG laser at 1064 nm with a maximum energy of 200 mJ per pulse focused on the surface of an orange. The optimized delay time, repetition rate, and laser energy were 1.28 μs, 2 Hz, and 120 mJ, respectively. LIBS spectra of peels of 40 oranges were collected. For comparison purpose, the samples of orange peels were also digested using a wet acid-assisted procedure and further analyzed by atomic absorption spectroscopy (AAS). A partial least squares (PLS) model was obtained by using 30 calibration samples and 10 prediction samples. The correlation coefficient between the measurements with LIBS and AAS was 0.9096 and 0.991 for the calibration and prediction sets, respectively. This result demonstrated that most results of direct analysis of Cd in Gannan navel oranges by LIBS were in reasonable agreement with those obtained by AAS after wet acid decomposition. Such performance shows that LIBS is a powerful tool for direct analysis of heavy metals in agricultural products without complex sample preparation.
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Abstract of article is published in Zhurnal Prikladnoi Spektroskopii, Vol. 80, No. 6, p. 964, November–December, 2013.
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Lin, H., Mingyin, Y., **long, L. et al. Determination of Cadmium in Gannan Navel Orange using Laser-Induced Breakdown Spectroscopy Coupled with Partial Least Squares Calibration Model. J Appl Spectrosc 80, 957–961 (2014). https://doi.org/10.1007/s10812-014-9873-1
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DOI: https://doi.org/10.1007/s10812-014-9873-1