Comparison of direct solid sampling and slurry sampling for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry
被引:37
作者:
Araujo, Rennan G. O.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC, Brazil
Univ Fed Bahia, Inst Quim, Grp Pesquisa Quim Analit, BR-40170290 Salvador, BA, BrazilUniv Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Araujo, Rennan G. O.
[2
,3
]
Oleszczuk, Nedio
论文数: 0引用数: 0
h-index: 0
机构:
Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Oleszczuk, Nedio
[1
]
Rampazzo, Roger T.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Rampazzo, Roger T.
[1
]
Costa, Pedro A.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Costa, Pedro A.
[1
]
Silva, Mdrcia M.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Silva, Mdrcia M.
[1
]
Vale, Maria Goreti R.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Vale, Maria Goreti R.
[1
]
Welz, Bernhard
论文数: 0引用数: 0
h-index: 0
机构:
Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC, BrazilUniv Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Welz, Bernhard
[2
]
Ferreira, Sergio L. C.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Fed Bahia, Inst Quim, Grp Pesquisa Quim Analit, BR-40170290 Salvador, BA, BrazilUniv Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Ferreira, Sergio L. C.
[3
]
机构:
[1] Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
[2] Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC, Brazil
Cadmium;
Wheat flour;
Slurry sampling;
Solid sampling;
ET AAS;
D O I:
10.1016/j.talanta.2008.06.047
中图分类号:
O65 [分析化学];
学科分类号:
070302 ;
081704 ;
摘要:
Two analytical methods for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry without prior sample digestion have been compared: direct solid sampling analysis (SS) and slurry sampling (SIS). Besides the conventional modifier mixture of palladium and magnesium nitrates (10 mu g Pd +3 mu g Mg), 0.05% (v/v) Triton X-100 has been added to improve the penetration of the modifier solution into the solid sample, and 0.1% H2O2 in order to promote an in situ digestion for SS. For SIS, 30 mu g Pd, 12 mu g Mg and 0.05% (v/v) Triton X-100 have been used as the modifier mixture. Under these conditions, and using a pyrolysis temperature of 800 C, essentially no background absorption was observed with an atomization temperature of 1600 C. About 2 mg of sample have been typically used for SS, although as much as 3-5 mg could have been introduced. In the case of SIS multiple injections had to be used to achieve the sensitivity required for this determination. Calibration against aqueous standards was feasible for both methods. The characteristic mass obtained with SS was 0.6 pg, and that with SIS was 1.0 pg. The limits of detection were 0.4 and 0.7 ng g(-1), the limits of quantification were 1.3 and 2.3 ng g(-1) and the relative standard deviation (n = 5) was 6-16% and 9-23% for SS and SIS, respectively. The accuracy was confirmed by the analysis of certified reference materials. The two methods were applied for the determination of cadmium in six wheat flour samples acquired in supermarkets of different Brazilian cities. The cadmium content varied between 8.9 +/- 0.5 and 13 +/- 2 ng g(-1) (n = 5). Direct SS gave results similar to those obtained with SIS using multi-injections; the values of both techniques showed no statistically significant difference at the 95% confidence level. Direct SS was finally adopted as the method of choice, due to its greater simplicity, the faster speed of analysis and the better figures of merit. (C) 2008 Elsevier B.V. All rights reserved.
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Bianchin, L
;
Nadvorny, D
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Nadvorny, D
;
da Silva, AF
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
da Silva, AF
;
Vale, MGR
论文数: 0引用数: 0
h-index: 0
机构:
Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Vale, MGR
;
da Silva, MM
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
da Silva, MM
;
dos Santos, WNL
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
dos Santos, WNL
;
Ferreira, SLC
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Ferreira, SLC
;
Welz, B
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Welz, B
;
Heitmann, U
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Bianchin, L
;
Nadvorny, D
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Nadvorny, D
;
da Silva, AF
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
da Silva, AF
;
Vale, MGR
论文数: 0引用数: 0
h-index: 0
机构:
Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Vale, MGR
;
da Silva, MM
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
da Silva, MM
;
dos Santos, WNL
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
dos Santos, WNL
;
Ferreira, SLC
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Ferreira, SLC
;
Welz, B
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
Welz, B
;
Heitmann, U
论文数: 0引用数: 0
h-index: 0
机构:Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil