Silver element standard oil and preparation method thereof

A standard oil and element technology, applied in the field of chemical measurement, can solve problems such as unknown composition, insufficient system stability, and influence on the performance of standard substances, and achieve the effects of uniform system, strong designability, and good storage stability

Active Publication Date: 2015-09-09
NO 53 RES INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The commercially available silver standard oil is an oily system with unknown composition, but the stability of the system is insufficient. After 6 months of storage at room temperature, the element content changes by more than 15%, and there will be obvious flocculent precipitation, which will affect the performance of the standard substance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Prepare 100 g of single-element standard oil with a silver element of 1000 μg / g.

[0018] Analytical-grade silver 2-ethylhexanoate was dried using phosphorus pentoxide for 2 h; 0.1003 g silver 2-ethylhexanoate (purity 99.7%), 1 g isooctane, and 4 g 2-ethylhexylamine were added to the dried tape In the flask of the desiccator, heat to 50°C, shake and dissolve to obtain a transparent solution; add 75.9g of polyalphaolefin base oil (accounting for 80% of the amount of base oil) with a kinematic viscosity of 100°C and 4cSt while it is hot, and mix well; naturally cool to room temperature , add surplus polyalphaolefin base oil to total weight 100g, mix uniformly, obtain the silver element standard oil that silver element is 1000 μ g / g.

[0019] The standard oil is stored at room temperature for 12 months, the silver element is 962μg / g, the change is not more than 5%, and there is no flocculation and precipitation.

Embodiment 2

[0021] Prepare 1000g of single-element standard oil with silver element of 100μg / g:

[0022] (1) Dry analytically pure silver 2-ethylhexanoate with phosphorus pentoxide for 8 hours;

[0023] (2) Heat and shake 0.1003g of dried silver 2-ethylhexanoate (99.7% purity), 30g of isooctane and 40g of 2-ethylhexylamine at 40°C until a transparent solution is obtained;

[0024] (3) Add 790.4g (accounting for 85% of the amount of base oil) of polyalphaolefin base oil with a kinematic viscosity of 5 cSt at 100°C while it is hot, and shake it evenly;

[0025] (5) Naturally cool to room temperature, add the remaining base oil to a total weight of 1000g;

[0026] (6) Shake well and evenly to obtain a silver standard oil with a silver content of 100 μg / g in the oil.

[0027] This lubricating oil is stored at room temperature for 12 months, the silver element is 103μg / g, the change does not exceed 5%, and it is uniform, pure and free of impurities.

Embodiment 3

[0029] Prepare 100g of single-element standard oil with silver element of 5000μg / g:

[0030] (1) Dry analytically pure silver 2-ethylhexanoate with phosphorus pentoxide for 10 hours;

[0031] (2) Heat and shake 0.5015g of dried silver 2-ethylhexanoate (99.7% purity), 4g of isooctane and 6g of 2-ethylhexylamine at 55°C until a transparent solution is obtained;

[0032] (3) Add 80.6g (accounting for 90% of the amount of base oil) of polyalphaolefin base oil with a kinematic viscosity of 6cSt at 100°C while it is hot, and shake it evenly;

[0033] (5) Naturally cool to room temperature, add the remaining amount of base oil to a total weight of 100g;

[0034] (6) Shake fully and evenly to obtain a silver standard oil with a silver content of 5000 μg / g in the oil.

[0035] This lubricating oil is stored at room temperature for 12 months, the silver element is 4823μg / g, the change does not exceed 5%, and it is uniform, pure and free of impurities.

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Abstract

The invention belongs to the technical field of stoichiometry, and relates to a silver element standard oil which is prepared by mixing and dissolving poly-alpha-olefin used as a base oil carrier, silver 2-ethylhexoate used as a silver element additive and a proper cosolvent used as an assistant. The silver element standard oil is composed of the poly-alpha-olefin base oil with the 100-DEG C kinematic viscosity of 4-6 cSt, cosolvent and silver 2-ethylhexoate, wherein the silver element content of the silver 2-ethylhexoate is 100-5000 mu g / g. The silver element standard oil has the advantages of high designability, uniform system and favorable storage stability. The preparation method is simple and controllable. The silver element standard oil is suitable for determining the silver element in lubricating oil, and suitable for determining the silver element in lubricating oil by establishing a standard curve by inductively coupled plasma-emission spectroscopy (ICP-AES) and rotating-disk-electrode spectroscopy.

Description

technical field [0001] The invention belongs to the technical field of stoichiometry, and relates to a standard material preparation technology, in particular to a silver element standard oil preparation technology. Background technique [0002] The silver element in lubricating oil can reflect the wear of silver-containing parts of mechanical equipment, such as plunger pumps, gears, spindles, bearings, etc. is of great significance. [0003] At present, there are mainly two methods for the determination of silver in lubricating oil: inductively coupled plasma emission spectrometry (ICP-AES) and rotating disk electrode spectrometry. Elemental standards are used to establish calibration lines or to calibrate instruments. The traditional silver element standard substance is an aqueous solution standard solution, which is usually obtained by dissolving silver nitrate in water. However, due to the differences in viscosity, chromaticity, and matrix between water and lubricating...

Claims

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Application Information

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IPC IPC(8): C10M169/04C10N40/02C10N40/04
Inventor 郭国建吴立军鲁毅柳洪超毛如增尤瑜生
Owner NO 53 RES INST OF CHINA NORTH IND GRP
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