Functionalization of chitosan with 3,4-dihydroxybenzoic acid for the adsorption/collection of uranium in water samples and its determination by inductively coupled plasma-mass spectrometry

Abstract

A chitosan resin derivatized with 3,4-dihydroxybenzoic acid moiety (CCTS-DHBA resin) was newly synthesized for the collection/concentration of trace uranium by using cross-linked chitosan (CCTS) as base material, and the adsorption behavior of uranium as well as 60 elements on the resin was examined by passing the sample solutions through a mini-column packed with the resin. After the elution of the collected elements on the resin with 1 M HNO 3 , the eluates were measured by inductively coupled plasma-mass spectrometry (ICP-MS).The CCTS-DHBA resin can adsorb several metal cations and several oxoanionic elements at appropriate pH. Among these metal ions, uranium shows an excellent adsorption behavior on this resin. Uranium as UO 2 2+ species can be adsorbed on the resin by chelating mechanism with adsorption capacity of 330 mg g -1 resin. Through the column treatment, the complete removal of large amounts of alkali and alkaline earth matrices without any loss of adsorption efficiency over prolonged usage were achieved with this resin.The CCTS-DHBA resin was applied to the adsorption/collection of uranium in tap water, river water and seawater samples with satisfactory results. The validation of the proposed method was carried out by analyzing uranium in the standard reference materials of SLRS-4, CASS-4, and NASS-5 after passing through the CCTS-DHBA resin, and the results showed good agreement with the certified values.

Functionalization of chitosan with 3-nitro-4-amino benzoic acid moiety and its application to the collection/concentration of molybdenum in environmental water samples

“…The column pretreatment procedures are similar to our previous work [15,[18][19][20][21]. The resin, packed in the mini-columns, was washed with each 10-mL of 2 M nitric acid and ultrapure water.…”

Quitosana: biopolímero funcional com potencial industrial biomédico

“…15 A presença de uma alta porcentagem de grupos amino reativos distribuídos na matriz polimérica permite inúmeras modificações químicas, tais como imobilização de agentes quelantes, quaternização, carboxilação, acilação, sulfonação, amidação, formação de complexo polieletrolítico etc. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] O biopolímero quitosana pode ser modificado fisicamente, sendo uma das vantagens mais interessantes a sua grande versatilidade em ser preparado em diferentes formas, tais como pós, flocos, microesferas, nanopartículas, membranas, esponjas, colméias, fibras e fibras ocas. 16, A Figura 2 ilustra micrografias de microesferas de quitosana reticuladas obtidas por spray drying.…”

Selective and Sensitive Determination of Uranyl Ions in Complex Matrices by Ion Imprinted Polymers‐Based Electrochemical Sensor

“…Currently,t he intense interest in uranium arises fromi ts known toxicity and the possibility of human exposure to it. Such exposure can cause acute renal failure,r esulting in af atality or minor damage to the liver [3] ,r espectively.T hus,d etermination of uranium requires high sensitivity and selectivity due to its strong association with other elements.T herefore,s everal analytical techniques such as inductively coupledp lasma atomic emission spectrometry [6],i nductively coupled plasma-masss pectrometry [7][8][9],n eutrona ctivation analysis,g amma and alpha spectrometry[ 10],g as chromatography [11,12],d ifferentialp ulse polarography [13],m ercury film silver based electrode [14],a nd electroanalysis using ion selective electrode [15][16][17] have been reported for uranium determination. Although thesem ethods benefit from ah igh sensitivity and favorable detection limits, their application requires expensive equipment and involves ah igherr unningc ost.…”