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Volume 7 Number 4 December 2022

Construction of A Turn On Probe for Al3+ Based on Rhodamine B Derivative


Authors: Huang Xiao-Juan ; Jun Zhang ; Yu Chun-Wei
Pages: 61-66
DOI: doi.org/10.32861/ajc.74.61.66
Abstract
As an unnecessary element for human body, aluminum can cause a variety of diseases when ingested in excess, so it is of great significance for Al3+ detection. A new rhodamine probe with excellent photochromic properties based on Al3+- induced ring-opening mechanism of the rhodamine spirolactam was proposed. Upon binding with Al3+, the generated 1:1 P1-Al3+ complex, confirmed by Job’s plot titrations analysis. Could exhibit a remarkable fluorescence enhancement with a limit of detection (LOD) of 0.33 μM, and colorimetric response toward Al3+ in presence of other common metal ions and anions. The design thought can enrich the development of probes for Al3+.

Detection of Haloacetic Acid in Swimming Pool in Haikou and Its Influencing Factors


Authors: Huang Xiao-Juan ; Guan Qing ; Yu Chun-Wei
Pages: 55-60
DOI: doi.org/10.32861/ajc.74.55.60
Abstract
Chlorine disinfection is a commonly applied disinfection products due to its effectiveness, strong disinfection ability, and low cost. The objective of this study is to investigate the occurrence of haloacetic acids (HAAs), a group of disinfection byproducts, in swimming pool and spa water, and analyze its influencing factors, so as to provide reference to understand the pollution status of haloacetic acid (HAAs) disinfection byproducts in swimming pool water in Haikou,  for the formulation of hygienic standards and sanitation management of HAAs in swimming pool water. The samples were collected from 18 swimming places with sanitary licenses in Haikou. For a period from April to July 2022. High performance liquid chromatography -tandem mass spectrometry (HPLC-MS) was used to detect the concentration of HAAs in swimming pool water, and its influencing factors were also analyzed. . Results indicated that the levels of average concentration of HAAs in indoor and outdoor swimming pools were 176.20 μg•L-1 and 241.53 μg•L-1, respectively. There were differences in the levels of HAAs in indoor and outdoor swimming places (p<0.05). The Pearson correlation analysis showed that the concentration of HAAs was positively correlated with free chlorine and urea (p<0.05). The water quality and sanitation of the swimming pools in this survey were somewhat poor. It is necessary to formulate the regulation of HAAs in the swimming pool sanitation standards, strengthen the water quality sanitation management, and take further effective measures to reduce the concentration of HAAs to protect swimmers.

Adsorption of UO 22+  on Fibrous Cerium Phosphate and its Alanine and Arginine Intercalated Materials


Authors: Hana B. AlHanash ; Ragiab A. M. Issa ; Heba A. AlJabo
Pages: 47-54
DOI: doi.org/10.32861/ajc.74.47.54
Abstract
Amorphous fibrous cerium (IV) phosphate (f-CeP) was prepared and characterized. Batch sorption method was performed to investigate uptake of uranyl ion (UO2)2+ aqueous solution by amorphous fibrous cerium phosphate f-CeP, using different variables in order to elucidate its applicability as a uranium sorption medium. Sorption of Uranyl ions was measured spectrophotometically after its extraction by 8-hydroxy quinoline, implementing best adsorption conditions (pH, contact time, ionic strength, amount of adsorbent, and initial uranyl ion concentration) for estimation. Exchange capacity of f-CeP was 4.25meq/g. Its x-ray powder diffraction pattern showed an amorphous material with d001 spacing value of 10.76 Å. While its amino acid intercalates showed a significant increase in the d001 to 11.33Å for f-CeP / alanine and 14.19Å for f-CeP / arginine.  From spectrophotometric analysis, the results showed that the maximum uranyl ion adsorption capacity reached the initial concentration of 50ppm, pH 4.5, contact time 3hrs and adsorption dosage of 2 g/L. However, amino acid intercalates showed less adsorption efficiency than their parent analogue.