A high-precision sampling scheme to assess persistence and transport characteristics of micropollutants in rivers was written by Schwientek, Marc;Guillet, Gaelle;Ruegner, Hermann;Kuch, Bertram;Grathwohl, Peter. And the article was included in Science of the Total Environment in 2016.Recommanded Product: N,N-(Ethane-1,2-diyl)bis(N-acetylacetamide) This article mentions the following:
Increasing numbers of organic micropollutants are emitted into rivers via municipal wastewaters. Due to their persistence many pollutants pass wastewater treatment plants without substantial removal. Transport and fate of pollutants in receiving waters and export to downstream ecosystems is not well understood. In particular, a better knowledge of processes governing their environmental behavior is needed. Although a lot of data are available concerning the ubiquitous presence of micropollutants in rivers, accurate data on transport and removal rates are lacking. Here, a mass balance approach is presented, which is based on the Lagrangian sampling scheme, but extended to account for precise transport velocities and mixing along river stretches. The calculated mass balances allow accurate quantification of pollutants’ reactivity along river segments. This is demonstrated for representative members of important groups of micropollutants, e.g., pharmaceuticals, musk fragrances, flame retardants, and pesticides. A model-aided anal. of the measured data series gives insight into the temporal dynamics of removal processes. The occurrence of different removal mechanisms such as photooxidation, microbial degradation, and volatilization is discussed. The results demonstrate, that removal processes are highly variable in time and space and this has to be considered for future studies. The high precision sampling scheme presented could be a powerful tool for quantifying removal processes under different boundary conditions and in river segments with contrasting properties. In the experiment, the researchers used many compounds, for example, N,N-(Ethane-1,2-diyl)bis(N-acetylacetamide) (cas: 10543-57-4Recommanded Product: N,N-(Ethane-1,2-diyl)bis(N-acetylacetamide)).
N,N-(Ethane-1,2-diyl)bis(N-acetylacetamide) (cas: 10543-57-4) belongs to amides. Compared to amines, amides are very weak bases and do not have clearly defined acid–base properties in water. On the other hand, amides are much stronger bases than esters, aldehydes, and ketones. Amides are stable compounds. The lower-melting members (such as acetamide) can be readily purified by fractional distillation. Most amides are solids which have low solubilities in water.Recommanded Product: N,N-(Ethane-1,2-diyl)bis(N-acetylacetamide)
Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics