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Showing 2 results for Ghanadzadeh
Performance evaluation of modified Fenton process using Nano scale zero-valent iron in nitrate reduction from aqueous solution
Behrooz Karimi, Mohamad Sadeg Rajaie, Mohamad Javad Ghanadzadeh, Masome Mashayekhi,
Volume 6, Issue 4 (3-2014)
Abstract

Backgrounds and Objectives: Nowadays, global concerns about nitrate in groundwater and its adverse impact on health have increased. This study aims to evaluate the efficiency of nitrate reduction from aqueous solution through modified Fenton process using Nano scale zero-valent iron. Material and Methods: This research was an experimental study and performed at laboratory scale. Nitrate reduction was conducted by advanced oxidation process of Fe°/FeІІ/FeШ/H2O2 at pH 2-10, contact time 10-90 min, nitrate concentrations of 50-300 mg/L, and the molar ratio of [H2O2]/[Fe] 0.5-5. The effect of adding H2O2, molar ratio of reagents, contact time, and pH on nitrate removal was examined and optimal conditions for each of these parameters were determined. Spectrophotometer Dr/5000 was used to measure nitrate in the effluent. Results: We found that the optimal parameters in our studywere pH 3, the molar ratio [H2O2]/[Fe°] of 0.5, and the contact time 15 min. By applying these conditions, nitrate removal efficiency at the retention time 15 min, initial nitrate concentration of 100 mg/L, iron concentration of 10 mg/L, and pH 4 for FeШ، FeІІ، Fe°، FeІІ/Fe°/H2O2 and FeШ/Fe°/H2O2 was 10.5, 27.6, 36.5, 62.3, and 74% respectively. Conclusion: According to the experimental results, it was determined that modified Fenton process using zero iron nano-particles can reduce nitrate under optimal conditions and this method can be used for the removal of similar compounds.


Assessment of exposure of pregnant mothers in Arak city to heavy metals lead, cadmium, and mercury and its effect on birth weight and infant growth relative to gestational age
Behrooz Karimi, Maryam Shokarpour, Nazila Najdi, Katayoun Vakilian, Mohammad Javad Ghanadzadeh, Marjan Mahlouji,
Volume 18, Issue 3 (12-2025)
Abstract
Background and Objective: Heavy metals such as lead, cadmium, and mercury, due to their bio-accumulative properties, pose significant risks to maternal and fetal health. This study investigated the association between exposure to these metals among pregnant women in Arak and adverse birth outcomes, including infant birth weight and growth status.
Materials and Methods: A cross-sectional study was conducted among 235 pregnant women residing in Arak in 2024. Inclusion criteria were residence in Arak, age under 18 years, and absence of psychological or cognitive disorders; exclusion criteria included migration or leaving the city during the study period. Participants were evaluated at two intervals: the first and second halves of pregnancy. Demographic and clinical data were collected, and urinary concentrations of lead, cadmium, and mercury were measured. The effects of metal exposure on birth weight and growth status, including small-for-gestational-age (SGA) and large-for-gestational-age (LGA), were assessed using linear and logistic regression models adjusted for maternal age, education, and body mass index.
Results: The mean birth weight was 3,232.5 g; 10.64%of infants were classified as SGA, and 3.40%as LGA. The mean urinary concentrations of lead, mercury, and cadmium were 0.48±0.84 μg/L, 2.64 ±1.40 μg/L, and 0.36±0.80 μg/L, respectively. Cadmium exposure during both phases of pregnancy was associated with reduced birth weight, while lead showed negative effects during late pregnancy. In early pregnancy, lead (OR =1.026) and cadmium (OR = 1.044) were associated with an increased risk of SGA, whereas mercury (OR = 1.042) was associated with LGA.
Conclusion: Cadmium and lead exposure reduce birth weight and increase risks of SGA and LGA, highlighting the need to minimize maternal exposure to heavy metals.
 

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