Femtosecond laser-induced surface nanostructures for enhanced trace metal element detection in water.

As societal concern for environmental and public health issues intensifies, precisely monitoring harmful heavy metal concentrations in aquatic systems has become a critical scientific endeavor. Although laser-induced breakdown spectroscopy (LIBS) allows for the simultaneous detection of multiple elements, its sensitivity for tracing metal in water remains inadequate. This work investigates the enhancement of LIBS signals for chromium (Cr) and lead (Pb) detection of micro/nanostructures on aluminum surfaces, generated by femtosecond laser irradiation.

Quantitative analysis of Cd based on the stress effect of minerals in rice by laser-induced breakdown spectroscopy.

Cadmium (Cd) is a highly toxic heavy metal that can accumulate in the food chain, posing a significant threat to human health. One of the key food sources through which Cd is often observed is rice. Therefore, determining heavy metals in rice is essential to assess the risk status of rice.

Prediction of heavy metal Cd and stress on minerals in rice by analysis of LIBS spectra.

To predict the nutrition and safety of agricultural products by laser-induced breakdown spectroscopy (LIBS), heavy metal Cd in rice was selected as an analytical target. Mature rice grain samples from 40 growing geographical areas around Poyang Lake were picked on-site and processed by grinding to obtain the edible rice. The content of Cd in rice samples was determined by graphite furnace atomic absorption spectrometry, and the rice pellets were detected by LIBS.

diagnosis of mature HLB-asymptomatic citrus fruits by laser-induced breakdown spectroscopy.

Laser-induced breakdown spectroscopy (LIBS) is a promising alternative to conventional methods in classifying citrus huanglongbing (HLB). Mature citrus fruits with similar features were picked and divided into healthy and HLB-asymptomatic groups. LIBS spectra and images were collected by focusing a laser on fresh fruit surfaces without sample preparation.