Method for Determination of Silver Boron Tin in Geochemical Exploration Samples

Abstract

The invention relates to a method for measuring silver, boron and tin in a geochemical exploration sample, for solving the problems of poor accuracy and precision while boron, tin and silver in soil are measured simultaneously in the original method; instruments, equipment and reagents are as follows: a grating spectrograph, an automatic photometer, an electrode, a spectrum sensitive plate, an agate mortar, a buffering agent and CdO, wherein the automatic photometer is connected to a computer; the electrode comprises an upper electrode and a lower electrode; the upper electrode is a conical graphite electrode; the lower electrode is 6 mm in outside diameter and is provided with a ring-shaped cup graphite electrode; the ring cup graphite electrode is 2 mm in ring height, 6 mm in ring outside diameter, 4 mm in hole inside diameter, 12.5 mm in hole depth, 13 mm in cup height, 5.2 mm in cup outside diameter, 4.0 mm in neck height and 3.5 mm in neck diameter; the mass percentage of the buffering agent is that mKI:mK2S207:mSiO2:mC:mZnO is 24:20:48:7:1; 0.015% of CdO is additionally added; a specimen is weighed; 0.0500 g of buffering agent is weighed and put into a crucible; after being stirred for one minute, the mixture is put into the electrode and subjected to pressing, spectrograph, development and photographic fixing; the automatic photometer translates a spectrum and analyzes internal standard line pairs as follows: Ag328.07 nm / Cd326.1 nm, B249.7 nm / Si249.4 nm, and Sn317.51 nm / Cd326.1 nm; a standard curve is automatically fit; the content of individual elements in a sample is automatically calculated.

Description

Technical field: [0001] The invention relates to the determination of trace elements in geochemical exploration samples by emission spectrometry. Background technique: [0002] With the development of geochemical surveys such as geological surveys, agricultural geological surveys, and environmental surveys in my country, high requirements have been put forward for the analysis and testing of trace elements in rocks and soils, both in analysis methods and testing techniques in recent years. Developed by leaps and bounds. In the multi-element trace analysis of rock, soil and other samples, Ag, B, Sn are more difficult to analyze, and the detection limit required for analysis is getting lower and lower. The measurement of Ag, B, and Sn by emission spectrometry has a long history; however, due to the many influencing factors of the measurement, its accuracy and reproducibility have been relatively poor. Judging from the existing analytical methods, the emission spectroscopy methods ...

AI Technical Summary

Problems solved by technology

Due to the low content of elements in the soil, the evaporation and excitation of this method are easily affected by the sample matrix and operating conditions. Even a small systematic analysis error will cause obvious problems in the jigsaw puzzle between geochemical exploration samples and interprovinces. impact, resulting in a large amount of rework

At present, the accuracy and precision of the above two methods for the simultaneous determination of the three elements of soil boron, tin and silver are not very good.

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