Univariate and multivariate calibration strategies in combination with laser-induced breakdown spectroscopy (LIBS) to determine Ti on sunscreen: A different sample preparation procedure

Author(s)

Speranca, Marco Aurelio ^[1] ; Andrade, Daniel Fernandes ^[1] ; Castro, Jeyne Pricylla ^[1] ; Pereira-Filho, Edenir Rodrigues ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Chem, High Way SP 310, Km 235, POB 676, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: OPTICS AND LASER TECHNOLOGY; v. 109, p. 648-653, JAN 2019.
• Web of Science Citations: 3

Abstract

Sunscreen is a cream which the intended use is to protect the human skin from ultraviolet radiation (UV) from the sun. Physical (inorganic) or chemical (organic) filters could be used to scatter the UV radiation, being TiO2, one physical filter widely used in its formulation. To determine Ti concentrations on sunscreen, laborious and unsafe procedures must be performed involving strong acids and high temperatures in furnaces. With laserinduced breakdown spectroscopy (LIBS) the possibility of determining this element with minimal sample preparation is feasible. In this study, Ti concentration on sunscreen was determined through several calibration approaches (univariate and multivariate) with LIBS and an unusual sample preparation for sunscreen using a solution of poly(vinyl)alcohol (PVA) to immobilize the sample, converting its matrix to solid. Five samples were prepared and analyzed by inductively coupled plasma optical emission spectrometry (ICP OES) and the Ti concentration ranged from 0.45 to 1.58%. Standard errors for cross validation (SECV) and recoveries were 0.07% and 97-104% using multiple linear regression (MLR) with information from two Ti emission lines: I 498.17 nm and I 499.11 nm. (AU)

• FAPESP's process: 16/01513-0 - Laser-Induced Breakdown Spectroscopy (LIBS) application in the analyses of electronic waste (printed circuit boards and polymers), food and difficult preparation liquid samples
• Grantee: Edenir Rodrigues Pereira Filho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/17304-0 - Proposition of methods for direct analysis of electronic waste samples: determination of precious, strategic and toxic elements in printed circuits boards and LCD screens
• Grantee: Daniel Fernandes de Andrade
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/17221-8 - Composition evaluation of hard discs from electronic waste using spectroanalytical techniques: rare earth and noble metals determination
• Grantee: Jeyne Pricylla Castro Castilho
• Support Opportunities: Scholarships in Brazil - Doctorate