Determination of Ca content of coral skeleton by analyte additive method using the LIBS technique

Laser-induced breakdown spectroscopic (LIBS) technique was used to study the elemental profile of coral skeletons. Apart from calcium and carbon, which are the main elemental constituents of coral skeleton, elements like Sr, Na, Mg, Li, Si, Cu, Ti, K, Mn, Zn, Ba, Mo, Br and Fe were detected in the coral skeletons from the Inani Beach and the Saint Martin’s island of Bangladesh and the coral from the Philippines. In addition to the qualitative analysis, the quantitative analysis of the main elemental constituent, calcium (Ca), was done. The result shows the presence of (36.15±1.43)% by weight of Ca in the coral skeleton collected from the Inani Beach, Cox’s Bazar, Bangladesh. It was determined by using six calibration curves, drawn for six emission lines of Ca I (428.301 nm, 428.936 nm, 431.865 nm, 443.544 nm, 443.569 nm, and 445.589 nm), by standard analyte additive method. Also from AAS measurement the percentage content of Ca in the same sample of coral skeleton obtained was 39.87% by weight which compares fairly well with the result obtained by the analyte additive method.

► Ca, C, Sr, Na, Mg, Li, Si, Cu, Ti, K, Mn, Ba, Mo, Br and Fe were detected in the coral skeletons from Bangladesh.
► Identical elements were detected in the coral skeletons of the Bay of Western Pacific near Philippines.
► The Ca content of the coral skeleton obtained from the Inani Beach of Bangladesh was determined.
► It was done by both analyte additive method employing LIBS technique and also by AAS methods.
► These two measurements compare pretty well with each other.