METHOD OF THE QUALITATIVE DETERMINATION OF MAGNESIUM IN THE OILS Russian patent published in 2006 - IPC G01N33/28 G01N31/16 

FIELD: chemical industry; petrochemical industry; analysis of the materials by the chemical methods.

SUBSTANCE: the invention is pertaining to the field of analysis of the materials by the chemical methods (by titration, with utilization of chemical indicators), containing the organic compounds of magnesium and may be used in chemical and a petrochemical industry at exercising control over the quality of petroleum. The invention provides, that magnesium chloride from the oil test is produced by impregnation of the ash-free filter with the tested oil with its subsequent incineration up to the complete ashing. Then the ash is dissolved in 30-40 cm³ of the weak 6 Mole/dm³ solution of hydrochloric acid. The produced solution id boiled within 15-20 minutes, transferred by a spray of the distilled water into the graduated flask. Take the aliquot, in which add the distilled water and neutralize it with ammonia (dropwise) up to pH=10.0, introduce the ammoniacal buffered solution and the indicating device the chromogen black ЕТ-100 and titrate 0.025 Mole/cm³ with the B-trilonum solution till the change of the a crimson-violet color into blue- pale blue, and quantity of magnesium (in mass%), is determined by the empirical formula. The invention allows to reduce the time duration for determination of the contents of magnesium, to improve the labor conditions due to exclusion from the process of the toxic and flammable benzole without reduction of requirements on toxicity and reliability of the produced results.

EFFECT: the invention ensures reduction of the time for determination of the contents of magnesium, improvement of the labor conditions, exclusion from the process of the toxic and flammable benzole without reduction of requirements to toxicity and reliability of the produced results.

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