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Multi-element Determinations Of N,n-dimethylformamide (dmf) Coal Slurries Using Icp-oes

机译：用Icp-oes多元素测定N，n-二甲基甲酰胺（dmf）煤浆

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A slurry nebulisation technique was applied for elemental analysis of bituminous coals SARM 18, SARM 19 and four coals from three different seams in Witbank, South Africa, by inductively coupled plasma optical emission spectroscopy (ICP-OES). Major elements (Al, Ca, Fe, Mg, S, Si and Ti) and trace elements (Ba, Cr, Mn, Ni, Sr, V, Zn and Zr) in coal were determined. Various slurry preparations were evaluated using two dispersants (glycerol and Triton X-100) and by varying the concentration of dispersants, between 0.1% and 1.0% (v/v). The effect of initially solubilising the ground coal in N,N-dimethylformamide (DMF) was investigated by varying the volume of DMF added. The effect of wet grinding with DMF was investigated. Wet grinding with DMF was shown to drastically reduce particle sizes (50.0% < 0.28 μm and 90.0% < 6.17 μm) as compared to dry grinding (50.0% < 5.25 μm and 90.0% < 11.1 μm). The reduced particle sizes and increased transport efficiency of the coal slurries led to improved analytical recoveries of elements in the reference coal, SARM 18. The best analytical recoveries for all elements were achieved using 0.1% Triton X-100 with 10.0% DMF. Results obtained by ICP-OES after wet grinding of the coal with DMF, using 0.1% Triton X-100, also gave excellent recoveries (Al, 100%; Ca, 103%; Cr, 106%; Fe, 102%; Mg, 100%; Mn, 104%; Ni, 109%; Si, 102%; Ti, 95.0%; and V, 108%). The results obtained with 10.0% DMF and 0.1% Triton X-100 were in agreement with certified values for all selected elements according to paired t-test at the 95.0% confidence level. Selected elements (Al, Ca, Fe, Mg, Mn, Si, Ti and V) were also analysed with X-ray fluorescence for comparison with results obtained from ICP-OES. Analysis by ICP-OES of microwave digested coal was also carried out. It is suggested that the DMF slurry technique could be used for routine analysis of bituminous coals.
机译：浆液雾化技术通过电感耦合等离子体发射光谱法（ICP-OES）被用于元素分析烟煤SARM 18，SARM 19和来自南非威特班克三个不同煤层的四种煤。确定了煤中的主要元素（Al，Ca，Fe，Mg，S，Si和Ti）和微量元素（Ba，Cr，Mn，Ni，Sr，V，Zn和Zr）。使用两种分散剂（甘油和Triton X-100）并通过在0.1％和1.0％（v / v）之间改变分散剂的浓度来评估各种浆料制备方法。通过改变DMF的添加量，研究了将煤粉最初溶解在N，N-二甲基甲酰胺（DMF）中的效果。研究了用DMF进行湿磨的效果。与干磨（50.0％<5.25μm和90.0％<11.1μm）相比，使用DMF进行湿磨可显着减小粒度（50.0％<0.28μm和90.0％<6.17μm）。煤泥粒径的减小和运输效率的提高导致标准煤SARM 18中元素的分析回收率提高。使用0.1％Triton X-100和10.0％DMF可以实现所有元素的最佳分析回收率。使用0.1％Triton X-100将煤与DMF湿磨后，通过ICP-OES获得的结果也具有出色的回收率（Al，100％; Ca，103％; Cr，106％; Fe，102％; Mg， 100％； Mn，104％； Ni，109％； Si，102％； Ti，95.0％；和V，108％）。根据配对t检验，在95.0％的置信度下，使用10.0％DMF和0.1％Triton X-100所得的结果与所有选定元素的认证值一致。还用X射线荧光分析了选定的元素（Al，Ca，Fe，Mg，Mn，Si，Ti和V），以与ICP-OES获得的结果进行比较。还进行了ICP-OES微波消解煤的分析。建议将DMF浆液技术用于烟煤的常规分析。

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