Analytical pyrolysis of humic substances: pitfalls, limitations, and possible solutions.
نویسنده
چکیده
Analytical pyrolysis is a technique currently used for investigating structural features of complex macromolecular materials. However, pitfalls appear to be widespread in pyrolysis studies of humic substances, and serious limitations can be experienced during the analytical procedure due to thermal reactions and configuration of the pyrolysis units and chromatographic systems. Pyrolysis presents inconsistencies for chemical studies, and the interpretation of the chemical structure of humic substances in light of information provided by pyrolysis data is, to say the least, hazardous. This paper examines possible solutions to some of the problems encountered in pyrolysis.
منابع مشابه
The Behaviour of Diborane-Reduced Fulvic Acids in Flash Pyrolysis Abstract
Francisco Martin and Francisco J. Gonzalez-Vila Instituto de Recursos Naturales y Agrobiologia (C.S.I.c.) Apartado 1052, 41 080-Sevilla, Spain It is suggested that the striking structural changes introduced in humic substances by reduction with diborane may be useful in studying the role of carboxyI groups in the behaviour of these substances in flash pyrolysis. In the preliminary results shown...
متن کاملThe role of humic substances in mitigating the harmful effects of soil salinity and improve plant productivity
The environmental, social and economical reasons indicate that the conventional agriculture constitute a continuous pressure contributing to the progressive worsening of environmental conditions, especially by an increasing apply high level of inputs. In this matter, the increasing use of saline irrigation water is one of the main factors resulting in salt accumulation in the plant rhizosp...
متن کاملNonlinear Analysis of Integrated Kinetics and Heat Transfer Models of Slow Pyrolysis of Biomass Particles using Differential Transformation Method
The inherent nonlinearities in the kinetics and heat transfer models of biomass pyrolysis have led to the applications of various numerical methods in solving the nonlinear problems. However, in order to have physical insights into the phenomena and to show the direct relationships between the parameters of the models, analytical solutions are required. In this work, approximate analytical solu...
متن کاملDeterminations of humic substances and other dissolved organic matter and their effects on the increase of COD in Lake Biwa.
Humic substances and other dissolved organic matter (DOM) in Lake Biwa and the surrounding rivers were investigated to elucidate their origins and behavior. An annual increase in chemical oxygen demand (COD) has been observed in the northern basin of Lake Biwa since 1985. The concentrations of dissolved organic carbon (DOC) in the northern and southern basins of Lake Biwa were 1.7-2.4 mgC/l and...
متن کاملبررسی کارائی نانوذرات سیلیکون در جذب اسیدهیومیک موجود در آب
Background and Objective: Humic substances in drinking water react with chlorine and form carcinogenic compounds. Humic acid is a principal component of humic substances and its separation from surface waters is crucial. Adsorption process is among different methods for separation of humic acid from surface waters and because of its simple and economical nature it has attracted considerable att...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Environmental science & technology
دوره 28 11 شماره
صفحات -
تاریخ انتشار 1994