測試對象:巖石、土壤等粉末樣品( >200目 )
測試周期:30-45個工作日,可提供樣品測試加急服務,加急樣品周期5-10個工作日。全套主微量元素分析可同步進行,周期仍為30-45個工作日。
送樣要求:1、樣品量需約3g,粒度≥200 目,請務必逐個自查,標準為將樣品粉末捻在手心無明顯顆粒感;2、編號清晰,紙袋折疊封裝;3、請勿用訂書機封訂;4、塑料袋包裝或樣品灑出的退回。
完成標準:保證樣品無污染,標樣和重復樣在允許誤差范圍內。
方法描述:
8.1全巖主量元素含量分析
燒失量通過減重法測定:
燒失量計算:LOI=100*(m0+m1-m2)/m1
m0 :坩堝質量; m1:樣品質量;m2:1000℃燒失后殘留樣品+空坩堝質量。
熔片:
全巖主量元素分析的樣品前處理采用熔融法制作玻璃熔片,助熔劑為四硼酸鋰-偏硼酸鋰-氟化鋰(45:10:5),氧化劑為,脫模劑為溴化鋰。熔融溫度1050℃、熔樣時長15min。
稱量試劑 | 稱量質量 |
固體溶劑(45Li2B4O7 : 10LiBO2 : 5LiF) | 6.0000±0.0002 g |
(NH4NO3) | 0.30±0.001 |
樣品 | 0.6000±0.0001 g |
全巖主量元素分析儀器使用日本理學(Rigaku)生產的 ZSX Primus Ⅱ型波長色散X射線熒光光譜儀(XRF),4.0kW端窗銠靶X射線光管,測試條件為電壓:50kV,電流:60mA,主量各元素分析譜線均為Kα,標準曲線使用國家標準物質巖石系列GBW07101-14、土壤系列:GSS07401-08、水系沉積物系列:GBW07302-12建立。數據校正采用理論α系數法,測試相對標準偏差(RSD)<2%。
8.2 Major element analyses of whole rock
The sample pretreatment of whole rock major element analysis was made by melting method. The flux is a mixture of lithium tetraborate, lithium metaborate and lithium fluoride (45:10:5), Ammonium nitrate and lithium bromide were used as oxidant and release agent respectively,The melting temperature was 1050 ℃ and the melting time was 15min.
Weighing reagents | Weighing weight |
45Li2B4O7:10LiBO2:5LiF | 6.0000±0.0002 g |
NH4NO3 | 0.30±0.001 |
sample | 0.6000±0.0001 g |
Zsx Primus II wavelength dispersive X-ray fluorescence spectrometer (XRF) produced by RIGAKU, Japan was used for the analysis of major elements in the whole rock, The X-ray tube is a 4.0Kw end window Rh target, The test conditions are voltage: 50kV, current: 60mA, All major element analysis lines are kα, The standard curve uses the national standard material, rock standard sample: GBW07101-14, soil standard sample: GBW07401-08, stream sediment standard sample: GBW07302-12. The data were corrected by theoretical α coefficient method, The relative standard deviation (RSD) is less than 2%.