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National Repository of Grey Literature 32 records found  beginprevious31 - 32  jump to record: Search took 0.01 seconds. 
Comparison of extraction methods for agriculture soil elemental analysis
 Štursa, Václav ; Vespalcová, Milena (referee) ; Diviš, Pavel (advisor)
This bachelor thesis handles with optimization of preparation process of soil samples from vineyards for elemental analysis performed by ICP-MS. First part of the thesis deals with element analysis and its usage in agrotechnics and viticulture, description of toxic and nutrition properties of individual elements and legislation defining appropriate concentration limits of elements in agricultural land. Next part describes commonly used methods for elemental analysis such as AES, AAS, roentgen fluorescence spectrometry and ICP-MS. Finally, sampling methods and methods for sample preparation such as digestion and extraction are described. Experimental part follows up comparison of selected extraction methods (2M HNO3 extraction, temperature assisted 2M HNO3 extraction, aqua regia extraction and microwave-assisted digestion using mixture of HNO3 and H2O2). These methods were applied on certified reference materials. Extracts were analysed by ICP-MS technique Best results were achieved by 2M HNO3 extraction. This extraction method was subsequently applied on real soil samples from vineyard.
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Vliv pneumatik na tahové vlastnosti traktorů
 Štursa, Václav
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