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Evaluation of some microbial agents, natural and chemical compounds for controlling tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae)

Nesreen M. Abd El-Ghany Atef Sayed Abdel-Razek Ibrahim M.A. Ebadah Youssf A. Mahmoud
Journal of Plant Protection Research | 2016 | vol. 56 | No 4 | DOI: 10.1515/jppr-2016-0055
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Autorzy i Afiliacje

Nesreen M. Abd El-Ghany
Atef Sayed Abdel-Razek
Ibrahim M.A. Ebadah
Youssf A. Mahmoud

Health risk assessment of pesticide residues in vegetables collected from Dakahlia, Egypt

Shehata E.M. Shalaby Gehan Y. Abdou Ibrahim M. El-Metwally Gomaa M.A. Abou-elella
Journal of Plant Protection Research | 2021 | vol. 61 | No 3 | 254-264 | DOI: 10.24425/jppr.2021.137951
Słowa kluczowe pesticides residues risk assessment vegetables
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Abstrakt

It has already been well established that long exposure to low doses of pesticidesis linked to consumer risks. So, this study purposed to investigate the amounts of pesticide residues and potential health risks associated with them. The risk assessment was determined by two methods: 1. Pesticide toxicity index (PTI) depending on the maximum residue limit (MRL) to calculate the hazard quotient (HQ); 2. Health risk assessment (HR) using acceptable daily intake (ADI) and estimated daily intake (EDI) to calculate the health index (HI). Pesticide residues were estimated in 176samples of the most popularly consumed vegetables collected from major retailers and markets in Dakahlia, Egypt (during 2018). There were 111 samples contaminated with pesticide residues (63.1%), of which 29 samples (16.48%) were higher than the maximum residue limits (MRL).Residues of 23 compounds were found in the analyzed samples, of which chlorpyrifos was the most frequentin 33 samples (18.75%);while cypermethrin was the lowest (detected in one sample). According to WHO toxicity classification, 12 of the detected pesticides were moderately hazardous (class II), seven pesticides belonged to class III (slightly hazardous), three compounds were found in class U (unlikely to pose an acute hazard with normal use), while carbofuran is a highly toxic compound (class Ib). Also, the obtained data revealed that, the HI’s for the individual pesticides ranged from 0.0018 to 64.0% of ADI indicates no risk of adverse effects following exposure to the individual pesticides. The cumulative exposure amounts (PTI values) ranged from 1.58 in snake cucumber to 128.44 in potato tubers, indicating that, the combined risk index of pesticide residues was a significant health risk for consumers according to the individual risk index.It can be concluded that there is a need for strict regulation and regular monitoring of pesticide residues in foodstuff for consumers’ health protection.
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Bibliografia


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Autorzy i Afiliacje

Shehata E.M. Shalaby
1
ORCID: ORCID
Gehan Y. Abdou
1
Ibrahim M. El-Metwally
2
Gomaa M.A. Abou-elella
1
  1. Pests and Plant Protection Department, National Research Centre, Dokki, Cairo, Egypt
  2. Botany Department, National Research Centre, Dokki, Cairo, Egypt

Investigation of Mechanical, Physical and Durability Properties of Metakaolin-Based Geopolymer

W.M.W. Ibrahim M. Ibrahim M.Z.A. Azis M.M. Al B. Abdullah A.S. Sauffi A. Romisuhani S.H. Adnan
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 3 | 1069-1075 | DOI: 10.24425/amm.2023.145477
Słowa kluczowe Metakaolin-based geopolymer durability sulphuric acid chemical attack mechanical and physical properties
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Abstrakt

Due to their potential to lower CO2 emissions linked with the cement and concrete industries, geopolymer binders are a desirable alternative for Portland cement binders. However, if they are to become a viable alternative to conventional Portland cement materials, their resilience in harsh conditions has to be further investigated. This paper presented mechanical and short-term durability properties of metakaolin based geopolymer concrete at sulphuric acid (H2SO4) solutions exposed with the concentrations of 2%, 3%, 4% and 5% for 14 days. (0%) or unexposed sample also prepared as referral and comparison. The geopolymer concretes were synthesized using an alkali activation of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). The main objective of the study was to examine the durability and deterioration mechanism parameters like different acid percentages, changes in weight, compressive strength, density and water absorption. Morphology analysis also performed in this study. The results indicated that metakaolin geopolymer experienced some strength deterioration with increasing sulphuric concentration solutions which are from 32.58 MPa, 20.67 MPa and 4.25 MPa at unexposed (0%), 2% and 5% sulphuric acid immersion respectively. Furthermore, change in weight or mass loss and water absorption after the chemical attack resulted directly proportional to sulphuric acid concentration due to increment of crack on the sample. Among that, the metakaolin geopolymer submerged in 2% acid gives the optimum results in terms of durability, mechanical and physical qualities.
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Autorzy i Afiliacje

W.M.W. Ibrahim
1 2
ORCID: ORCID
M. Ibrahim
2 3
ORCID: ORCID
M.Z.A. Azis
1
ORCID: ORCID
M.M. Al B. Abdullah
2 3
ORCID: ORCID
A.S. Sauffi
2 3
ORCID: ORCID
A. Romisuhani
1 2
ORCID: ORCID
S.H. Adnan
4
ORCID: ORCID
  1. Universiti Malaysia Perlis (UniMAP), Faculty of Mechanical Engineering Technology, 02600, Arau, Perlis, Malaysia
  2. Universiti Malaysia Perlis (UniMAP), Center of Excellence Geopolymer & Green Technology (CeGeoGTech), 02600, Arau, Perlis, Malaysia
  3. Universiti Malaysia Perlis (UniMAP), Faculty of Chemical Engineering Technology, Taman Muhibbah, Jejawi, 02600 Arau, Perlis, Malaysia
  4. Universiti Tun Hussein Onn, Faculty of Engineering Technology, Pagoh, Johor, Malaysia

The Influence of Foaming Agent Towards Metakaolin Based Alkali Activated Materials Properties and Cu2+ Adsorption

M. Ibrahim W.M.W. Ibrahim M.M. Al B. Abdullah L.H. Mahamud M.N.N. Tajuddin Nur Faezah Yahya
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 3 | 1077-1086 | DOI: 10.24425/amm.2023.145478
Słowa kluczowe Metakaolin alkali activated materials hydrogen peroxide aluminium powder and copper ions adsorption
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Abstrakt

The performance of adsorbent synthesized by alkali activation of aluminosilicate precursor metakaolin with sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) as well as the foaming agent was studied for copper ions adsorption from aqueous solution. This paper investigated the effect of adding hydrogen peroxide (H2O2) and aluminium powder as foaming agents to an alkali activated materials slurry. The experimental range included 0.50 wt%, 0.75 wt%, and 1.00 wt% hydrogen peroxide and 0.02 wt%, 0.04 wt%, and 0.06 wt% aluminium powder. A control sample without a foaming agent was also created for comparison. The specific surface area, water absorption, density, compressive strength and microstructure of metakaolin based alkali activated materials were evaluated. The adsorption capability of Cu2+ with addition of hydrogen peroxide and aluminium powder was then tested. Results indicate hydrogen peroxide addition had superior pore size distribution and homogeneous porosity than aluminium powder, implying improved copper ion elimination. Cu2+ adsorption capability reached 98% with 0.75 wt% hydrogen peroxide and 24.6076 m2/g surface area. The results demonstrating that low cost metakaolin-based AAMs are the most effective adsorbent for removing copper ions.
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Autorzy i Afiliacje

M. Ibrahim
1 2
ORCID: ORCID
W.M.W. Ibrahim
2 3
ORCID: ORCID
M.M. Al B. Abdullah
1 2
ORCID: ORCID
L.H. Mahamud
1
ORCID: ORCID
M.N.N. Tajuddin
1
ORCID: ORCID
Nur Faezah Yahya
ORCID: ORCID
  1. Universiti Malaysia Perlis (UniMAP), Faculty of Chemical Engineering Technology, Taman Muhibbah, Jejawi, 02600 Arau, Perlis, Malaysia
  2. Universiti Malaysia Perlis (UniMAP), Center of Excellence Geopolymer & Green Technology (CeGeoGTech), 02600, Arau, Perlis, Malaysia
  3. Universiti Malaysia Perlis (UniMAP), Faculty of Mechanical Engineering Technology, 02600, Arau, Perlis, Malaysia

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