PREPARACIÓN DEL ESTÁNDAR SECUNDARIO DE CLORPIRIFOS TRATAMIENTO DE MUESTRAS VALIDACIÓN MÉTODO DE DETERMINACIÓN DE CLORPIRIFOS POR GC-MS VALIDACIÓN MÉTODO DE DETERMINACIÓN DE CLORPIRIFOS POR HLPC VALIDACIÓN MÉTODO DE DETERMINACIÓN DE CLORPIRIFOS POR VOLTAMPEROMETRÍA DETERMINACIÓN DE LOS NIVELES DE CLORPIRIFOS EN LECHE DE VACUNO REMOCIÓN DE CLORPIRIFOS CON MICORRIZAS

This study evaluated the accumulation of Cd(II), Pb(II) and Cr(VI) by colonies of Nostoc commune "murmunta", carried out in hydroponics, the quantification of Cd(II) and Pb(II) was performed by Anodic Stripping voltammetry and for Cr(VI) by spectrophotometry with diphenylcarbazide. A total of 330 colonies of cyanobacteria were distributed in 10 experimental groups. For the determination of the accumulation of Cd(II) and Pb(II) sampleswere taken from the internal fluid of the colonies of cyanobacteria, selected at random, every 3 days for a period of 21 days and in the case of the Cr(VI) every 4 days for a period of 28 days. The results demonstrated that the colonies develop without being subjected to strict growing conditions or prior treatments and are very easy to collect. The greatest concentration of accumulated Pb(II) was 80,40 mg/L on the twelfth day (container with 160 mg/L), equi...

The use of organophosphates (OPPs) in agriculture is an environmental problem due to their persistence in the environment, affecting non-target species, including human beings. For this reason, this study evaluated the degradation of chlorpyrifos (CPF) and profenofos (PFF) simultaneously in soils at sublethal concentrations in the presence of Eisenia foetida (EF) and a native bacterial consortium (NBC). For this, we first studied the avoidance behavior of EF to soils contaminated with CPF and PFF by calculating the percentage avoidance response (AR%), f inding that EF presents an avoidance behavior to soils contaminated with CPF (6.45 to 65.5 mg/kg) and PFF (2.26 to 112.95 mg/kg) and their mixture, giving values of AR% (+). EF did not show avoidance behavior with AR% (-) values when melon rinds were added as substrate making it feasible to study the degradation of CPF and PFF at concentr...

Lactobionic acid (LBA) is a polyhydroxy acid with attractive properties in the pharmaceutical, cosmetic, food, medical, and chemical industries, making it a versatile product with multiple applications, which supports the various studies aimed at its production by increasingly more simple, efficient, and environmentally friendly processes. For this reason, the purpose of this research was to synthesize gold nanoparticles (AuNPs) by a synthesis process using Myrciaria dubia (Camu camu) fruit extract. Subsequently, AuNPs were used to produce LBA from lactose. The results demonstrate that the Myrciaria dubia extract manages to synthesize AuNPs that were characterized by UV/vis spectrophotometry, energy-dispersive X-ray spectroscopy (EDX), and Zetasizer. LBA was quantified by FTIR-ATR spectroscopy and ion chromatography. The results showed that AuNPs succeeded in producing LBA from lactose s...