Utility of solid phase extraction for colorimetric determination of lead in waters, vegetables, biological and soil samples

Zakia Al-Mallah,Alaa S. Amin 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.67 No.-

A highly sensitive, selective and rapid method for the determination of lead based on the reaction of lead(II) with 5-(4′-chlorophenylazo)-6-hydroxypyrimidine-2,4-dione (CPAHPD) and the solid phase extraction of the Pb(II)–CPAHPD complex with Amberlite XAD-2000 was developed, in the presence of pH 5.6 buffer solution and Triton X-114 medium. CPAHPD reacts with lead to form a violet complex with a molar ratio of 2:1 (CPAHPD to lead). This complex was enriched by the solid phase extraction with Amberlite XAD-2000. An enrichment factor of 500 was obtained by elution of the complex from the resin with a minimal amount of isopentyl alcohol (0.2 mL). In isopentyl alcohol medium, the molar absorptivity of the complex is 1.13 × 106 L mol−1 cm−1 at 647 nm. Beer’s law is obeyed in the range of 5.0–160 ng mL−1 in the measured solution. The relative standard deviation for 10 replicate samples of 50 ng mL−1 level is 1.26%. The detection and quantification limits reaches 1.5 and 4.7 ng mL−1 in the original samples. The presented procedure was successfully applied for determination of lead content in real samples such as vegetables, waters, biological and soil samples with satisfactory results.

Utilization of a triacetylcellulose membrane to immobilize 5-(2′,4′-dimethylphenylazo)-6-hydroxypyrimidine-2,4-dione for erbium determination in real samples

Zakia Al-Mallah,Alaa S. Amin 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-

A membrane optode formed by physical inclusion of a chromophore 2-amino-6-(1,3-thiazol-2yldiazenyl)phenol (ATDP) into a plasticized cellulose triacetate (CTA) matrix was investigated for preconcentration, extraction and colorimetric determination of Er(III) from aqueous samples. The optode was examined for erbium uptake in borate buffer medium (∼125 ng mL−1) at pH 8.5–9.0. The inclusion of an anion-exchanger tri-isooctylamine (TiOA) was found to be necessary for the formation of Er(III)–ATDP complex in the optode matrix, resulting into distinct color change of the optode from red to violet color after erbium sorption. The composition of the optode was prepared by varying the amounts of different plasticizers and TiOA to obtain minimum response time towards Er(III) in borate buffer medium. The effects of different experimental parameters involved in the detection and quantification of Er(III) using optode were optimized. The optode analytical performance was performed in terms of interference of cations and anions, reusability, equilibration time, detection limit, etc. and compared with the conventional colorimetric method for Er(III) using different chromophores. The optode developed in the present study was tested in real samples with good results comparing to the GF-AAS method.

An Intelligent System for Filling of Missing Values in Weather Data

Maqsood Ali Solangi,Ghulam Ali Mallah,Shagufta Naz,Jamil Ahmed Chandio,Muhammad Bux Soomro International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.9

Recently Machine Learning has been considered as one of the active research areas of Computer Science. The various Artificial Intelligence techniques are used to solve the classification problems of environmental sciences, biological sciences, and medical sciences etc. Due to the heterogynous and malfunctioning weather sensors a considerable amount of noisy data with missing is generated, which is alarming situation for weather prediction stockholders. Filling of these missing values with proper method is really one of the significant problems. The data must be cleaned before applying prediction model to collect more precise & accurate results. In order to solve all above stated problems, this research proposes a novel weather forecasting system which consists upon two steps. The first step will prepare data by reducing the noise; whereas a decision model is constructed at second step using regression algorithm. The Confusion Matrix will be used to evaluation the proposed classifier.

Prognostic value of chronic total occlusions detected on coronary computed tomographic angiography

Opolski, Maksymilian P,Gransar, Heidi,Lu, Yao,Achenbach, Stephan,Al-Mallah, Mouaz H,Andreini, Daniele,Bax, Jeroen J,Berman, Daniel S,Budoff, Matthew J,Cademartiri, Filippo,Callister, Tracy Q,Chang, Hy BMJ Group 2019 Heart Vol.105 No.3

<P><B>Objective</B></P><P>Data describing clinical relevance of chronic total occlusion (CTO) identified by coronary CT angiography (CCTA) have not been reported to date. We investigated the prognosis of CTO on CCTA.</P><P><B>Methods</B></P><P>We identified 22 828 patients without prior known coronary artery disease (CAD), who were followed for a median of 26 months. Based on CCTA, coronary lesions were graded as normal (no atherosclerosis), non-obstructive (1%–49%), moderate-to-severe (50%–99%) or totally occluded (100%). All-cause mortality, and major adverse cardiac events defined as mortality, non-fatal myocardial infarction and late coronary revascularisation (≥90 days after CCTA) were assessed.</P><P><B>Results</B></P><P>The distribution of patients with normal coronaries, non-obstructive CAD, moderate-to-severe CAD and CTO was 10 034 (44%), 7965 (34.9%), 4598 (20.1%) and 231 (1%), respectively. The mortality rate per 1000 person-years of CTO patients was non-significantly different from patients with moderate-to-severe CAD (22.95; 95% CI 12.71 to 41.45 vs 14.46; 95% CI 12.34 to 16.94; p=0.163), and significantly higher than of those with normal coronaries and non-obstructive CAD (p<0.001 for both). Among 14 382 individuals with follow-up for the composite end point, patients with CTO had a higher rate of events than those with moderate-to-severe CAD (106.56; 95% CI 76.51 to 148.42 vs 65.45; 95% CI 58.01 to 73.84, p=0.009). This difference was primarily driven by an increase in late revascularisations in CTO patients (27 of 35 events). After multivariable adjustment, compared with individuals with normal coronaries, the presence of CTO conferred the highest risk for adverse cardiac events (14.54; 95% CI 9.11 to 23.20, p<0.001).</P><P><B>Conclusions</B></P><P>The detection of CTO on non-invasive CCTA is associated with increased rate of late revascularisation but similar 2-year mortality as compared with moderate-to-severe CAD.</P><P><B>Trial registration number</B></P><P> NCT01443637.</P>

Kinetics, isotherm, and thermodynamic studies of the adsorption of reactive red 195 A dye from water by modified Switchgrass Biochar adsorbent

Mohamed E. Mahmoud,Gehan M. Nabil,Nabila M. El-Mallah,Heba I. Bassiouny,Sandeep Kumar,Tarek M. Abdel-Fattah 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-

A method is described for efficient decolorization of reactive red 195 A dye (RR-195A) from aqueous andwastewater samples using modified Switchgrass Biochar (SB) by tetradecyltrimethyl ammoniumbromide (TTAB) as a cationic surfactant for the formation of a novel SB-TTAB adsorbent. The differentcontrolling experimental conditions such as solution pH, initial dye concentration, contact time,adsorbent mass, interfering ions and temperature have been investigated and optimized. Adsorptionequilibrium using Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D–R) isotherm modelshave been also studied and the best fit was related to the Langmuir adsorption isotherm. Adsorptionkinetics have been tested and illustrated using pseudo first-order, pseudo-second-order, intraparticlediffusion and Elovich models. The collected results confirmed that the pseudo-second order kineticmodel exhibited the best fit with the experimental data. Thermodynamic parameters were calculatedand the results referred to an exothermic nature and spontaneity of the adsorption process. Improveddecolorization of reactive red 195 A dye from textile industrial wastewater and other water sampleswere successfully established. Excellent recovery values of RR-195A dye by SB-TTAB adsorbent weredetermined in the ranges of 96.61–98.76%, 97.79–99.26%, 94.24–100.0% and 90.98–92.96% ( 1.0–4.0%)from tap water, raw water, wastewater and sea water, respectively

Enhanced decolorization of reactive black 5 dye by active carbon sorbent-immobilized-cationic surfactant (AC-CS)

Gehan M. Nabil,Mohamed E. Mahmoud,Nabila M. El-Mallah 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3

Activated carbon-immobilized-cationic surfactant (AC-CS) was designed to enhance the decolorizationbehavior of reactive black 5 (RB5), as an anionic dye, from aqueous and industrial wastewater samples inpresence of various controlling experimental conditions. Experimental data indicated that the dyeadsorption capacity by (AC-CS) was higher in strongly acidic and basic solutions. An anion exchange andion–ion interaction mechanisms were proposed in the acidic solution, while only anion exchangemechanism was suggested in the basic aqueous solution. The adsorption behavior and thermodynamicparameters were also evaluated. Treatments of textile industrial wastewater and real water samples weresuccessfully established (95.23–100.00%).

Detection and Phylogenetic Analysis of Viruses Linked with Fig Mosaic Disease in Seventeen Fig Cultivars in Palestine

Rana Majed Jamous,Salam Yousef Abu Zaitoun,Omar Bassam Mallah,Munqez Shtaya,Toufic Elbeaino,Mohammed Saleem Ali-Shtayeh 한국식물병리학회 2020 Plant Pathology Journal Vol.36 No.3

Fig mosaic is a viral disease (FMD) that spreads in Palestinian common fig (Ficus carica L.) orchards. Recognizing the economic value of fig plants and the harmful nature of FMD, the disease poses a significant threat to the economy of the fig production in Palestine. We applied the reverse transcription and amplification (RT-PCR) and PCR technique to leaf samples of 77 trees and 14 seedlings of 17 fig cultivars. The samples were collected from orchards in the main fig-growing provinces of the Palestinian West Bank, to assess the prevalence of viruses associated with FMD, and con- firm a possible link of symptoms with viruses detected. Four viruses were detected: Fig mosaic virus (FMV), Fig badnavirus-1 (FBV-1), Fig leaf mottle-associated virus 2 (FLMaV-2), and Fig fleck-associated virus (FFkaV). FMV and FBV-1 were found in all tested fig plants (100%), while FLMaV-2 and FFkaV were detected in 61.5% and 33% of the fig samples, respectively. The high incidence of FBV-1 in the newly propagated symptomatic and symptomless seedlings from differ- ent cultivars may be an indication that FBV-1 is integrated into the genome of the fig in a cultivar nondiscriminatory manner. Very weak or no association was detected between FMD symptoms severity in the 17 Palestinian fig cultivars with the various viruses’ combinations observed (i.e., number of the viruses infecting the plant). These results support the notion that FMD symptom severity expression is likely to be controlled by a combination of FMV infection, cultivars, and environmental factors, rather than the number of viruses infecting the plant.

Biological and Molecular Characterization of Tomato brown rugose fruit virus (ToBRFV) on Tomato Plants in the State of Palestine

Rana Majed Jamous,Salam Yousef Abu Zaitoun,Omar Bassam Mallah,Mohammed Saleem Ali-Shtayeh 한국식물병리학회 2022 식물병연구 Vol.28 No.2

The incidence of Tomato brown rugose fruit virus (ToBRFV) and biological and molecular characterization of the Palestinian isolates of ToBRFV are described in this study. Symptomatic leaf samples obtained from Solanum lycopersicum L. (tomatoes) and Nicotiana tabacum L. (cultivated tobacco) plants were tested for tobamoviruses infection by reverse transcription polymerase chain reaction. Tomato leaf samples collected from Tulkarm and Qalqilia are infected with ToBRFV-PAL with an infection rate of 76% and 72.5%, respectively. Leaf samples collected from Jenin and Nablus were found to be mixed infected with ToBRFV-PAL and Tobacco mosaic virus (TMV) (100%). Sequence analysis of the ToBRFV-PAL genome showed that the net average nucleotide divergence between ToBRFV/F48-PAL strain and the Israeli and Turkish strains was 0.0026398±0.0006638 (±standard error of mean), while it was 0.0033066±0.0007433 between ToBRFV/F42-PAL and these two isolates. In the phylogenetic tree constructed with the complete genomic sequence, all the ToBRFV isolates were clustered together and formed a sister branch with the TMV. The sequenced Palestinian isolates of ToBRFV-PAL shared the highest nucleotide identity with the Israeli ToBRFV isolate suggesting that the virus was introduced to Palestine from Israel. The findings of this study enhance our understanding of the biological and molecular characteristics of ToBRFV which would help in the management of the disease.

Optimization of lithium separation conditions from Caspian seawater using fuzzy logic combined with dispersive liquid–liquid extraction

Romina Pourhassan Motlagh Sharemi,Abbas Rashidi,Mohammad Hassan Mallah,Jaber Safdari 한국자원공학회 2019 Geosystem engineering Vol.22 No.3

For optimization of separation conditions of lithium from the Caspian seawater, a new combination technique of liquid–liquid extraction and fuzzy logic is being used. In this research, disperser and extraction solvents, and ligand of benzo15-crown-5, have been quickly injected. It went to cloudy form solution contain small extraction solvent drops. The impact of different parameters such as the kind and concentration of benzo15-crown-5, the volume of disperser and extraction solvents, pH and extraction time have been optimized on the extraction percentage and analyzed using fuzzy logic. The effect of other metal ion on extraction percentage was also investigated. Under the optimized conditions (volume of tetrachloroethylene: 1.5 mL, volume of acetone: 120 mL, volume of benzo15-crown-5: 0.1 mL, concentration of benzo15-crown-5: 0.001 mol/L, and pH: 1), the extraction has increased to 74% for the synthesis sample and 31% for the real sample from Caspian seawater.

Improved 5-year prediction of all-cause mortality by coronary CT angiography applying the CONFIRM score

Deseive, Simon,Shaw, Leslee J.,Min, James K.,Achenbach, Stephan,Andreini, Daniele,Al-Mallah, Mouaz H.,Berman, Daniel S.,Budoff, Matthew J.,Callister, Tracy Q.,Cademartiri, Filippo,Chang, Hyuk-Jae,Chin Oxford University Press 2017 European heart journal cardiovascular Imaging Vol.18 No.3