Portable XRF fluorescence spectrometer Compass200 soil heavy metals analyzer method of sample preparation: tabletting method
Sample preparation methods: tabletting method
For granulating, first of all, the sample (< 2 mm particles) drying under 105 ℃ for 24 h, then in the planetary ball mill (Retsch PM type 200 grinding machine, Germany) is shown in figure 1 (a) used in the two tungsten carbide grinding jar (50 nl; German Retsch), 10 with tungsten carbide ball (10 mm in diameter) (FIG. 1 b). Before the change the direction of rotation, clockwise rotate at a speed of 400 RPM for 5 minutes, five minutes counterclockwise, and cease to 10 seconds.
Figure 1. The planet type ball mill (A), with tungsten carbide tungsten carbide steel ball used in the tank of loose soil work (B) and hydraulic press (C).
Portable XRF fluorescence spectrometer Compass200 soil heavy metals analyzer method of sample preparation: tabletting method
Through only in the absence of adhesive to suppress the preliminary experiment of soil samples. According to observation, for sandy sample dn (clay content is 175 g – 3), the particle is fragile and brittle (figure 2 a). As a result, adhesive added to improve the quality of the aggregate is decisive. According to the similarity and analysis blank (i.e., the soil fertility assessment element in the lower analyte mass fraction) of the select adhesive test. In this case, you can use the glue, such as microcrystalline cellulose powder (Signa – Aldrich, Merck, Darmstadt, Germany) and cellulose (SPEX 3642, Metuchen, Ratio of w – 1 NJ, USA) of 10% and 15%, grinding/homogeneous time for 10, 15 and 20 minutes
Portable XRF fluorescence spectrometer Compass200 soil heavy metals analyzer method of sample preparation: tabletting method
FIG. 2. Without adding adhesive and milling time of different soil samples (A); Particles through different milling time, concentration of cellulose and brands (B) test results. Samples of the grinding and homogenizing in hydraulic Press (SPEX 3624 b X – Press) granulating figure 1 c) to 0.8 g powdered materials transferred to stainless steel in the suite, and exert 8.0 t cm to 2 for 3 minutes. Cylindrical pill is about 15 mm in diameter, thickness of 2 mm, unit area per unit mass is 0.45 g cn – 2. Visual check aggregate, assess its homogeneity and integrity. In addition, the precipitation of XRF spectrum (as described in section 2.5, using pXRF) also compared the loose soil samples, to assess the possible pollution in the process of grinding. Cellulose adhesive with 10% ww – 1 Darnstadt Signa – Aldrich, Merck, Germany) further experiment was carried out, and in the planet type ball mill grinding for 20 minutes. In powder form are also considered in the analysis of the samples. The dried samples in the sieve pore size is 2 nn screening. Transfer the 10 grams of test sample to the assembled 31 mm XRF polyethylene cup (no. 1530, Chemplex Industries Inc., Florida palm city) made with thickness of 4 m of polypropylene film (American SPEX, no. 3520)
COMPASS 200 soil element analyzer is a portable XRF fluorescence spectrometer, mobile laboratory test platform and the soil heavy metal detection experts
COMPASS 200 soil element analyzer features
Analysis of up to 40 kinds of elements in soil at the same time
Integrated design, portable mobile analysis laboratory
The operation is simple, quick learning
Nondestructive, rapid and accurateMeet all kinds of complex samples field test: solid, liquid, powder
Portable XRF fluorescence spectrometer Compass200 soil heavy metals analyzer method of sample preparation: tabletting method
