Determination of Manganese in Cassava Leaves by Slurry Sampling Flame Atomic Absorption Spectrometry

Abstract

Cassava, Manihot esculenta crantz, constitutes one of the main foods consumed by most of the population of developing countries, mainly in the population of low income. It is largely used for its low cost and the diversity of its root and leaves products. In this paper, a slurry sampling flame atomic absorption spectrometric method for the determination of manganese in cassava leaves is proposed. The slurry sampling was used in order to shorten 2206 Downloaded by [National Sun Yat-Sen University] at 07:03 26 December 2014 the analysis time and to minimize the problems associated with solid sample treatment such as wet acid digestion, dry-ashing, sample contamination, and analyte loss. The samples of cassava leaves were washed with extran 10% (v=v), soon afterwards they were dried in an oven to 60 C, triturated in a mill of spheres, and the obtained material was sifted in a mesh of 100 micrometers. Then 0.1 g of the sample was weighed in a balloons volumetric flask, the volume was completed with 25 mL of acid nitric 2,0 mol L À1 , and followed by 20 minutes in an ultrasonic bath and subsequent reading in FAAS. The analyses of the certified reference material of spinach and apple leaves evidenced the accuracy of the method.The proposed method was applied for the determination of manganese in four samples of cassava leaves acquired in markets from Feira de Santana City, Brazil. The concentration of manganese found in cassava leaves varied from 202.7 to 181.3 mg g À1 , with detection and quantification limits of 0.17 and 0.56 mg g À1 , respectively. The precision expressed as relative standard deviation (RSD) was 1.7 and 3.2% (n ¼ 10) for 100 and 12 mg g À1 , respectively.

Old and New Flavors of Flame (Furnace) Atomic Absorption Spectrometry

“…Simple strategies can be based on the preparation of slurries or extractions assisted by ultrasound mechanical waves or microwave radiation. The feasibility of introduction of slurries prepared using ultrasound bath was demonstrated for determination of Mn in cassava leaves [1] and Zn in yogurt [2]. Both procedures used a 20 min sonication time, and determination was performed using conventional FAAS or HR-CS-FAAS, respectively.…”

Simple Method for Determination of Lead in Hair Dyes Using Slurry Sampling Graphite Furnace Atomic Absorption Spectrometry

“…Most of the methods proposed in the literature to determine the concentration of metals in complex matrices involve the acid digestion of samples. However, some strategies for direct determination, either without predigestion or with a simple preparation, have been frequently studied as ways to minimize analysis time, cost, contaminants, and the loss of sample, as well as to improve the detection limits and the sensitivity of the methods (Amorim et al 2011;Froes et al 2009;Dias et al 2009;Bujan-Villar et al 2011). The solid and slurry sampling techniques are therefore attractive alternatives (Fernandes et al 2007).…”

Solid-phase extraction of heavy metal ions on bucky tubes disc in natural water and herbal plant samples

“…Atomic absorption spectrometry, atomic emission spectrometry, electroanalytical techniquesm, etc. are used for the heavy metal determinations (Ganjavi et al 2010;Kadi 2009;Zarzecka and Gugala 2009;Matraszek and Hawrylak-Nowak 2009;Galitsopoulou et al 2009;Dias et al 2009;Moraes et al 2009;Pashkova 2009;Balakrishna and Pervez 2009). The lower levels of analytes than the detection limit of instruments are one of the important problems in these determinations (Soylak 1998;Soylak et al 2000;Rezaei et al 2009;Aydin et al 2009;Gonzalvez et al 2009).…”