Investigation on the Performance of Chemically Modified Aquatic Macrophytes—Salvinia molesta for the Micro-Solid Phase Preconcentration of Cd(II) On-Line Coupled to FAAS

Abstract

In this study, a new method for the preconcentration of cadmium ions using modified aquatic macrophytes - Salvinia molesta as biosorbent in an on-line preconcentration system coupled to flame atomic absorption spectrometry (FAAS) was developed. The method is based on preconcentration of 20.0 mL sample at pH 3.75 through 35.0 mg of biosorbent at 10.0 mL min and subsequent elution with 0.5 mol L HNO. A preconcentration factor of 31-fold, linear dynamic range from 5.0 to 70.0 µg L (r = 0.9996) and detection and quantification limits of 0.15 and 0.51 µg L were obtained. The characterization of the biosorbent chemically modified with NaOH and citric acid, was performed through FTIR and SEM measurements. The method precision was found to be 3.97 % and 1.48 % for 5.0 and 60.0 µg L Cd(II) solutions, respectively. The applicability of method was checked by analysis of different kind of water samples and certified reference material.

Lithium Accumulation in Salvinia natans Free-Floating Aquatic Plant

“…The increase in these peaks could be an indication of the plant’s response to stress conditions, as amides are known to have an important role in the plant’s defense mechanism [ 82 ]. The peak at 1426 cm −1 was assigned to the C–H groups [ 83 ]. The peaks around 1250 cm −1 correspond to the C–O stretch in carboxylic acids, while those at 1130–1000 cm −1 correspond to the vibration of C–O–C and O–H in polysaccharides [ 84 ].…”

“…The peaks around 1250 cm −1 correspond to the C–O stretch in carboxylic acids, while those at 1130–1000 cm −1 correspond to the vibration of C–O–C and O–H in polysaccharides [ 84 ]. The peak around 1067 cm −1 , observed in the SC, SW1, SW2, and SW3, can be assigned to the C–O stretching of alcohols and carboxylic acids [ 83 ]. In the S. natans grown in spring waters, a strong peak appeared around 880 cm −1 , indicating the linkage of β–glycosides in the molecular structure of polysaccharides [ 79 ].…”

“…In the S. natans grown in spring waters, a strong peak appeared around 880 cm −1 , indicating the linkage of β–glycosides in the molecular structure of polysaccharides [ 79 ]. The bands below 800 cm −1 are the fingerprint region of the phosphate and sulphur functional groups [ 83 , 84 ].…”