Humus, its Structure and Role in Agriculture and Environment by J Kubát

By J Kubát

This quantity offers the lawsuits of the tenth internationalsymposium Humus et Planta held in Prague in August 19-23,1991. the most subject matters of this e-book are dedicated to the recentadvances in primary, in addition to utilized examine of humicsubstances, the main ample of the obviously occuringmacromolecules of nature, the certainty in their natureand how they react and engage of their common environments. Read more...

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1990). As i t is assumed th a t upon p y r o l y s i s r e l a t i v e l y la r g e fragments are generated, which escape a n a l y s i s by conventional te chniques , the use o f such columns w i l l provide a d d i t i o n a l could from p y r o l y s i s - f i e l d be matched with those originated info rm a tio n, which io nizatio n mass spectrometry. To conclude, a n a l y t i c a l p y r o l y s i s i s a s e n s i t i v e technique f o r i n v e s t i g a t i n g h u m if ic a t io n processes, and combined with other d e s t r u c t i v e and n o n -d e s tr u c tiv e techniques can provide i n s i g h t on the complex macromolecular s t r u c t u r e o f humic substances .

1989; Tegelaar, 1990) offered new i n s i g h t s to the chem istry o f humic permitted subs tances , because p y r o l y s i s products, they and the s o - c a l l e d cutans and suberans) a lip h a tic present and in the resistant characterization, (s p o r o p o ll e n i n , in cutins, terms of sube rin s, and to r e l a t e t h e i r p y r o l y s i s products with those obtained from humic f r a c t i o n s . trip le ts the o f i n t r a c t a b l e m a t e r ia ls Therefore, p y r o ly s a t e of humic biopolymers isolated a c id s from it was assumed th a t the have algal its ce ll o r i g i n in the w a l l s and/or c u t i c l e s and barks (F ig ure 1).

Such as Cu2+, Fe2+, Fe^+ , Mn2+, Co2+, Sn2 + , e q u i li b r i u m info rm ation complexing ca pa c it y o f HS toward metal ion (S e n e si, (ii) HS by two p o s s i b l e and to calculate the 1990c). Fluorescence quenching o f o rg a n ic c h e m ic a ls . A fl uore scence quenching method has been developed and a pp li ed s u c c e s s f u l l y to measure Kqq va lu es f o r the b in d in g of o rga n ic chem icals w ith high fluorescence e ffic ie n c y , such as p o l y c y c l i c aromatic hydrocarbons (PAH), to va rio u s FA and HA in aqueous s o l u t i o n under v a r i a b le pH and i o n i c stren gth c o n d i t io n s ( S e n e si, 1990c).

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