A novel extraction-based procedure for the determination of cadmium in marine macro-algae using HR-CS GF AAS,Analytical Methods

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A novel extraction-based procedure for the determination of cadmium in marine macro-algae using HR-CS GF AAS
Analytical Methods ( IF 2.7 ) Pub Date : 2017-08-16 00:00:00 , DOI: 10.1039/c7ay01283g
Mauana Schneider _{1,

2,

3,

4} , Daiane P. C. de Quadros _{1,

2,

3,

4} , Bernhard Welz _{1,

2,

3,

4,

5} , Eduardo Carasek _{1,

2,

3,

4} , Duardo de Oliveira Bastos _{4,

6} , Leonardo Rubi Rorig _{4,

7}

Affiliation

This work proposes a simple method for the determination of Cd in macro-algae by high-resolution continuum source graphite furnace atomic absorption spectrometry. An acid digestion procedure in a thermostatic bath has been developed using only small volumes of HNO₃ and H₂O₂. The acid and oxidant concentrations as well as the bath time have been optimized using multivariate analysis, aiming at a total extraction of the analyte without spending much time with sample preparation. Ir has been employed as the permanent chemical modifier for improving performance and sensitivity. The accuracy of the proposed method has been evaluated by comparison with inductively coupled plasma mass spectrometry after microwave-assisted acid digestion, showing results without statistical difference (based on a t-test with a confidence interval of 95%). The results were also compared with a certified reference material, BCR 679 (white cabbage), and the value obtained with the proposed method did not show any statistical difference with the certified one. The limit of detection of the method was 7.5 ng g⁻¹ Cd. The proposed procedure can be described as safe, reliable, fast, accurate and low-cost, mainly when compared with microwave-assisted digestion, which demands a relatively large volume of acids, specific instrumentation and significantly more time.

中文翻译：

基于HR-CS GF AAS的基于萃取的新颖方法测定海洋大型藻类中的镉

这项工作提出了一种简单的方法，通过高分辨率连续谱源石墨炉原子吸收光谱法测定大型藻类中的镉。仅使用少量的HNO ₃和H ₂ O ₂开发了恒温浴中的酸消解程序。使用多变量分析优化了酸和氧化剂的浓度以及浴时间，目的是在不花费大量时间进行样品制备的情况下完全提取分析物。Ir已被用作永久化学改性剂，以改善性能和灵敏度。通过与微波辅助酸消解后的电感耦合等离子体质谱法进行比较，评估了所提出方法的准确性，结果无统计学差异（基于t-测试的置信区间为95％）。还将结果与经过认证的参考材料BCR 679（白菜）进行了比较，通过本建议方法获得的值与经认证的参考材料没有任何统计学差异。该方法的检测限为7.5 ng g ^-1 Cd。与微波辅助消解相比，拟议的过程可被描述为安全，可靠，快速，准确和低成本，这主要需要相对大量的酸，特定的仪器和明显更多的时间。

更新日期：2017-09-21

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