title: Standard dilution analysis of beverages by microwave-induced plasma optical emission spectrometry.
abstract: In this work, standard dilution analysis (SDA) is combined with microwave-induced plasma optical emission spectrometry (MIP OES) to determine seven elements in coffee, green tea, energy drink, beer, whiskey and cachaça (Brazilian hard liquor). No sample preparation other than simple dilution in HNO3 1% v v(-1) is required. Due to relatively low plasma temperatures, matrix effects may compromise accuracies in MIP OES analyzes of complex samples. The method of standard additions (SA) offers enhanced accuracies, but is time-consuming and labor intensive. SDA offers a simpler, faster approach, with improved accuracies for complex matrices. In this work, SDA's efficiency is evaluated by spike experiments, and the results are compared to the traditional methods of external calibration (EC), internal standard (IS), and standard additions (SA). SDA is comparable to the traditional calibration methods, and it provides superior accuracies for applications involving ethanol-containing beverage samples. The SDA-MIP OES procedure is effective. Using only two calibration solutions, it may be easily automated for accurate and high sample throughput routine applications.
authors: Department of Physics and Chemistry, UNESP-Univ Estadual Paulista, Av. Brasil, 56, Ilha Solteira, SP 15385-000, Brazil.
authors: Daniel A
authors: DA
authors: Goncalves
authors: Agilent Technologies, 2500 Regency Parkway, Cary, NC 27518, USA.
authors: Tina
authors: T
authors: McSweeney
authors: Department of Analytical Chemistry, UNESP-Univ Estadual Paulista, R. Prof. Francisco Degni, 55, Quitandinha, Araraquara, SP 14800-060, Brazil.
authors: Mirian C
authors: MC
authors: Santos
authors: Department of Chemistry, Wake Forest University, Salem Hall, Box 7486, Winston-Salem, NC 27109, USA.
authors: Bradley T
authors: BT
authors: Jones
authors: Department of Chemistry, Wake Forest University, Salem Hall, Box 7486, Winston-Salem, NC 27109, USA. Electronic address: donatigl@wfu.edu.
authors: George L
authors: GL
authors: Donati
mesh_terms: D001628:Beverages / Q000032:analysis*; D007201:Indicator Dilution Techniques; D008872:Microwaves; D058626:Plasma Gases; D013054:Spectrophotometry, Atomic / Q000379:methods* / Q000592:standards
chemical_list: D058626:Plasma Gases
keywords: Beverages; Calibration; Matrix effects; Matrix-matching; Microwave-induced plasma; Standard dilution analysis