A spectrofluorimetric method for the direct analysis of carbendazim [methyl 2-benzimidazole carbamate (MBC)] fungicide and its metabolite 2-aminobenzimidazole (2-AB) in natural waters is described. Very low limit of d...A spectrofluorimetric method for the direct analysis of carbendazim [methyl 2-benzimidazole carbamate (MBC)] fungicide and its metabolite 2-aminobenzimidazole (2-AB) in natural waters is described. Very low limit of detection (LOD) and limit of quantification (LOQ) values of 0.002 - 0.06 ng/mL and 0.006 - 0.2 ng/mL, respectively, were determined by spectrofluorimetric method with small relative standard deviation (RSD) values < 1%. This spectrofluorimetric method was applied to the determination of MBC and 2-AB residues in natural waters, with satisfactory recovery values of (88.5% - 119.2%).展开更多
The objective of this study was to examine the photodegradation of rimsulfuron in natural waters from the Niayes agricultural zone in Senegal.This was conducted in both the presence and absence of oxalic acid,which ac...The objective of this study was to examine the photodegradation of rimsulfuron in natural waters from the Niayes agricultural zone in Senegal.This was conducted in both the presence and absence of oxalic acid,which acts as a photosensitiser.The photodegradation values of rimsulfuron in distilled water and natural waters were found to be 15.52%and 6.3%to 7.19%,respectively.The results demonstrate that rimsulfuron is relatively stable in natural waters under solar radiation in the absence of photosensitiser.The photodegradation percentage in distilled water was 68.57%,while the range in natural water was from 16.98%to 40.32%.The results clearly show that oxalic acid significantly accelerates the photodegradation of the herbicide rimsulfuron.The photodegradation reaction half-life time varies considerably,from 144.41 to 693.15 minutes,with the highest value observed in surface water(runoff water),which generally contains a greater quantity of dissolved organic matter.We then examined the herbicidal activity of the compound in question.The results of this study indicate that the herbicidal activity of rimsulfuron may be attributed to either the initial product or a combination of the initial product and its photoproduct.展开更多
基金the Service of Cooperation and Cultural Action of the Embassy of France for financial support
文摘A spectrofluorimetric method for the direct analysis of carbendazim [methyl 2-benzimidazole carbamate (MBC)] fungicide and its metabolite 2-aminobenzimidazole (2-AB) in natural waters is described. Very low limit of detection (LOD) and limit of quantification (LOQ) values of 0.002 - 0.06 ng/mL and 0.006 - 0.2 ng/mL, respectively, were determined by spectrofluorimetric method with small relative standard deviation (RSD) values < 1%. This spectrofluorimetric method was applied to the determination of MBC and 2-AB residues in natural waters, with satisfactory recovery values of (88.5% - 119.2%).
文摘The objective of this study was to examine the photodegradation of rimsulfuron in natural waters from the Niayes agricultural zone in Senegal.This was conducted in both the presence and absence of oxalic acid,which acts as a photosensitiser.The photodegradation values of rimsulfuron in distilled water and natural waters were found to be 15.52%and 6.3%to 7.19%,respectively.The results demonstrate that rimsulfuron is relatively stable in natural waters under solar radiation in the absence of photosensitiser.The photodegradation percentage in distilled water was 68.57%,while the range in natural water was from 16.98%to 40.32%.The results clearly show that oxalic acid significantly accelerates the photodegradation of the herbicide rimsulfuron.The photodegradation reaction half-life time varies considerably,from 144.41 to 693.15 minutes,with the highest value observed in surface water(runoff water),which generally contains a greater quantity of dissolved organic matter.We then examined the herbicidal activity of the compound in question.The results of this study indicate that the herbicidal activity of rimsulfuron may be attributed to either the initial product or a combination of the initial product and its photoproduct.
