Evaluation of Commercial Active Carbons for the Removal of s-Triazine Herbicides from Waters

The adsorption capacity of powdered active carbons, used in a water treatment facility, for the removal of the triazine herbicides propazine, prometryn and prometon, was evaluated. Kinetic studies showed that some of the carbon samples used could be suitable in the practice for the treatment of moderate contents of the herbicides in contaminated waters. Equilibrium studies showed that the data fit the Frumkin isotherm. The results show that in the adsorption process there are repulsive lateral interactions that depend mainly of the adsorbate molecules rather than the nature or distribution of adsorption sites. Such lateral interactions seem to be established mainly between the isopropyl groups of adjacent molecules, being of the same order for the three molecules. The effectiveness of the active carbons was evaluated by determining the percentage of reduction achieved by each product.

Bioaccumulation and Elimination Rule of Prometryn inHard Clam Meretrix meretrix

The bioaccumulation and elimination rule of prometryn in hard clam Meretrix meretrix were studied under semistatic conditions. Whenthe water temperature was （12±1）℃, M. meretrix were exposed to the seawater containing 1, 10, and 100 μg/L prometryn. The content of prometrynin M. meretrix increased with the increase of exposed concentration, and both had significant positive correlation. The accumulation of prometryn inM. meretrix first increased then decreased, and finally fluctuated at a certain level. The maximum accumulation content was observed in M. meretrixwhen exposed to prometryn for 10, 14 and 18 d, and the maximum bioaccumulation factors （BCFs） were 22.9, 8.3 and 4.3, respectively. At the forthday of the elimination test, the content of prometryn in M. meretrix of each group were decreased above 50%. At the 22ndday of the elimination test,the content of prometryn in M. meretrix were decreased to 8.7%, 5.6% and 2.6% of the initial content in the elimination test, respectively. The results indicated that hard clam M. meretrix had strong bioaccumulation and elimination ability on prometryn.

Fluorescence strip sensor for sensitive determination of prometryn in foods

We report the development of a sensitive,fast,and simple method for the detection of prometryn(PRO)in potato and celery using a lateral flow immunochromatographic assay(LFIA).A monoclonal antibody(mAb)against PRO was prepared under optimized conditions,and the 50%inhibition concentration(IC50)for use in ELISA was determined to be 0.6 ng mL−1.Moreover,the cut-off value for use in an LFIA was 50 ng mL−1.To validate the reliability of the developed LFIA strip,real samples were used,and the recovery rate was found to be 99.3-104.3%.The assays were completed within 8 min,demonstrating the suitability of our developed methods for the detection of PRO in potato and celery.