Ash Residues from Petroleum Catalytic Cracking Feed Stocks

Gunn, E. L.; Powers, J. M.

doi:10.1021/ac60064a033

Cited by 12 publications

(2 citation statements)

References 21 publications

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“…The coefficients of variation for nickel and vanadium appear to be Nine analyses. 6 Two results not included in calculations. ' Three results not included in calculations.…”

Section: Resultsmentioning

confidence: 99%

Wet Ash Spectrochemical Method for Determination of Trace Metals in Petroleum Fractions

Hansen¹,

Hodgkins²

1958

Anal. Chem.

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VI. In each case a nickel concentration of 1.18 p.p.m. was used and an approximately 25 fold excess of the foreign ion was introduced. The recommended procedure was followed.At the concentration level studied only cobalt, copper, silver. and manganese appear to interfere seriously with the determination of nickel. Cobalt forms a complex which has an absorbance maximum a t 475 mp and this curve overlaps the nickel curve sufficiently to cause serious interferences when the recommended procedure is followed and when the cobalt and nickel concentrations are approximately equal. It is possible that by measuring the absorbance a t both 520 and 475 mp, nickel could be satisfactorily determined in the presence of cobalt. Table VI, citrate ion does not seriously interfere with the color reaction and this should be useful for complexing many of the heavy metal ions which would otherwise interfere by forming precipitates under the conditions used. In none of the experiments with cations reported in Table As indicated in

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“…The coefficients of variation for nickel and vanadium appear to be Nine analyses. 6 Two results not included in calculations. ' Three results not included in calculations.…”

Section: Resultsmentioning

confidence: 99%

Wet Ash Spectrochemical Method for Determination of Trace Metals in Petroleum Fractions

Hansen¹,

Hodgkins²

1958

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…The technique is simple in that it does not require the manipulations of separation and measurement employed in chemical procedures, hence a large number of samples of this type can be analyzed routinely at a nominal cost. Details of the experimental technique have been described (9).…”

Section: Colorimetric Methods For Determining Individual Componentsmentioning

confidence: 99%