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Estimation of carbon stored in forest ecosystems requires accurate biomass prediction tools. The objective of this study was to determine the individual aerial biomass of Prosopis affinis and its distribution by component, to develop allometric models for the estimation of biomass and to estimate biomass expansion factors (BEF) in native forests of Entre Ríos (Argentina). Dendrometric variables on 30 individuals of different diameter classes were measured. Values of total aerial biomass and component biomass (trunk, branches larger than 5 cm in diameter and branches smaller than 5 cm + leaves, flowers and fruits) were determined using the destructive method. Different models were developed, and the best models were selected according to the adjusted coefficient of determination (R2adj), mean squared prediction error, the Akaike information and Bayesian information criteria and the Furnival index. The variables crown area, diameter at breast height and total height were the best estimators of total aerial biomass and component biomass of P. affinis. The single-variable model based on the basal diameter has a very good predictive capacity for total aerial biomass, resulting in a simple model of great practicality. The BEF was significantly different among diameter classes, with mean values between 2.28 and 4.90. The highest values corresponded to individuals with trunk diameters larger than 25 cm. The models developed in this work present high precision (R2adj. ≥ 0.94) for the prediction of total aerial biomass of P. affinis and can be applied in the native forest area of the province of Entre Ríos (Argentina).

Palabras clave: contaminación, herbicida, cuantificación, inmunoensayo RESUMENLos herbicidas constituyen fuentes potenciales de contaminación, siendo el agua uno de los componentes del ambiente más vulnerables. El glifosato (N-fosfonometil glicina) es el herbicida más utilizado a escala mundial. Actualmente, la información referida a su efecto sobre el agua resulta insuficiente, dado fundamentalmente por los altos costos de los análisis de laboratorio. Los objetivos del presente trabajo fueron evaluar el empleo de la técnica de ELISA como una herramienta rápida para el monitoreo de la calidad de aguas y cuantificar la concentración de glifosato por medio de la técnica de UHPLC-MS/MS. Cuando la técnica de ELISA determina valores positivos de glifosato, se requiere la cuantificación mediante la técnica de UHPLC-MS/MS para determinar la concentración exacta de glifosato en dichas muestras. Los resultados sugieren que la técnica de ELISA es factible de ser implementada en programas de monitoreo de aguas, constituyendo un método exploratorio que permite detectar cualitativamente la presencia o ausencia de glifosato.Key words: contamination, glyphosate, quantification, immunoassay ABSTRACTHerbicides are potential sources of pollution; water being one of the most vulnerable components of the environment. Glyphosate (N-phosphonomethyl glycine) is the most widely used herbicide worldwide. Currently, the information on its effect on water is insufficient, mainly because of the high costs of lab tests. The objectives of this study were to evaluate the use of the ELISA technique as a quick tool for monitoring water quality and to quantify the concentration of glyphosate through the technique of UHPLC-MS/MS. When ELISA positive values determined glyphosate, quantification Rev. Int. Contam.

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Argentina is one of the countries with a vibrant agricultural sector, which provides both economic development opportunities and environmental challenges. Argentina was selected as a case study due to its rich land degradation data, its diverse agroecological systems, and rapid poverty reduction. The country also represents high human development index countries. This study reports the cost of