MilliporeSigma
  • Home
  • Search Results
  • Determination of sulfur in crude oil using high-resolution continuum source molecular absorption spectrometry of the SnS molecule in a graphite furnace.

Determination of sulfur in crude oil using high-resolution continuum source molecular absorption spectrometry of the SnS molecule in a graphite furnace.

Talanta (2015-12-24)
Heloisa R Cadorim, Éderson R Pereira, Eduardo Carasek, Bernhard Welz, Jailson B de Andrade
ABSTRACT

An analytical method for the determination of sulfur, as the tin mono-sulfide (SnS) molecule, in crude oil using high-resolution continuum source graphite furnace molecular absorption spectrometry (HR-CS GF MAS) has been developed. The molecular absorbance of the SnS has been measured using the wavelength at 271.624 nm and the crude oil samples were prepared as micro-emulsions due to their high viscosity. Several chemical modifiers (Ir, Pd, Ru, Zr) were tested and palladium was chosen, because it exhibited the best performance. The heating program was optimized by comparing the pyrolysis and vaporization curves obtained for an aqueous sulfur standard and a micro-emulsion of a crude oil certified reference material (CRM). The optimum pyrolysis and vaporization temperatures were found to be 600 and 2000°C, respectively. The limit of detection and the characteristic mass using micro-emulsion analysis of crude oil samples were 5.8 and 13.3 ng S. Accuracy and precision of the method has been evaluated using two crude oil CRM (NIST 2721 and NIST 2722), showing good agreement with the informed or certified values.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Nitric acid, 70%, purified by redistillation, ≥99.999% trace metals basis
Sigma-Aldrich
o-Xylene, anhydrous, 97%
Sigma-Aldrich
Hydrogen chloride, ReagentPlus®, ≥99%
Sigma-Aldrich
Nitric acid, ACS reagent, ≥90.0%
Sigma-Aldrich
Nitric acid, puriss. p.a., 65.0-67.0%
Sigma-Aldrich
Nitric acid, puriss. p.a., ≥65% (T)
Sigma-Aldrich
Nitric acid, puriss. p.a., reag. ISO, reag. Ph. Eur., for determinations with dithizone, ≥65%
Sigma-Aldrich
o-Xylene, puriss. p.a., ≥99.0% (GC)
Sigma-Aldrich
Nitric acid, red, fuming, HNO3 >90 %
Sigma-Aldrich
Nitric acid, ACS reagent, 70%
Sigma-Aldrich
o-Xylene, reagent grade, ≥98.0%
Sigma-Aldrich
Hydrogen chloride solution, 1.0 M in diethyl ether
Sigma-Aldrich
Hydrochloric acid, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., fuming, ≥37%, APHA: ≤10
Sigma-Aldrich
Hydrogen chloride solution, 1.0 M in acetic acid
Sigma-Aldrich
Hydrochloric acid, 37 wt. % in H2O, 99.999% trace metals basis
Sigma-Aldrich
Hydrochloric acid, ACS reagent, 37%
Sigma-Aldrich
Hydrogen chloride solution, 2.0 M in diethyl ether
Sigma-Aldrich
Hydrogen chloride solution, 4.0 M in dioxane
Sigma-Aldrich
4-Methyl-2-pentanone, ACS reagent, ≥98.5%
Sigma-Aldrich
4-Methyl-2-pentanone, ≥99%
Sigma-Aldrich
Hydrochloric acid solution, 32 wt. % in H2O, FCC
Supelco
Hydrochloric acid solution, volumetric, 0.1 M HCl (0.1N), endotoxin free
Sigma-Aldrich
Hydrochloric acid solution, 1.0 N, BioReagent, suitable for cell culture
Sigma-Aldrich
4-Methyl-2-pentanone, ≥99%, FCC
Sigma-Aldrich
Hydrochloric acid solution, ~6 M in H2O, for amino acid analysis
Sigma-Aldrich
Hydrochloric acid, 36.5-38.0%, BioReagent, for molecular biology
Sigma-Aldrich
Hydrogen chloride solution, 3 M in cyclopentyl methyl ether (CPME)
Sigma-Aldrich
Hydrochloric acid, puriss., 24.5-26.0%
Sigma-Aldrich
Hydrochloric acid, meets analytical specification of Ph. Eur., BP, NF, fuming, 36.5-38%
Sigma-Aldrich
Hydrochloric acid, ACS reagent, 37%