Study On Determination Of Boron In The Export Orange And Producing Area Soil In Guangxi By Atomic Absorption Spectrometry

On the basis of a review of the application and progress in the methods of determination of Boron in China and abroad, the microwave samples treatment technique under pressure was used for rapid samples treatment and the methods for direct or indirect determination of Boron by atomic absorption spectrometry (AAS) was selected. This research focused on the methods of determination Boron by AAS and extraction of available Boron. The following aspects were investigated in this thesis:The indirect determination of total Boron in the soil of orange plantation by flame atomic absorption spectrometry (FAAS) with Neocuproine- Cu( â…  )-BF₄^-was investigated. After the sample was digested by HF, H₃PO₄, H₂SO₄ with microwave, BF₄^- had come into being. The BF₄^- and [Cu(NCP)]⁺ formed a hydrophobic grouping of association molecule, which can be extracted by 4-mothyl-2-pentanone. The amount of total Boron was measured by determination of Copper in the organic phase by FAAS. The results of determination of Boron in standard samples and artificial Aluminum, Iron ,Calcium, Magnesium samples were satisfactory.It was studied that the availible Boron in the soil can be extracted in a closed PTFE cup by microwave energy. The radiation power of microwave was 1.36KW. Both the pressure and the heating time were programmed from 0.10MPa for 90s, and then 0.2MPa for 125s, respectively. The test results of this method were in good agreement with refluxing extraction method. When the confident level was 95%, there was no significant difference between this...