A rapid method for the determination of organic nitrogen and phosphorus based on a single perchloric acid digestion

1966 ◽  
Vol 34 ◽  
pp. 360-366 ◽  
Author(s):  
Dimitris S. Galanos ◽  
Vassilios M. Kapoulas
Keyword(s):  
Rapid Method ◽  
Perchloric Acid ◽  
Organic Nitrogen ◽  
Acid Digestion ◽  
Nitrogen And Phosphorus

The Determination of Iodine in Biologic Material

1964 ◽  
Vol 10 (9) ◽  
pp. 799-823 ◽  
Author(s):  
H Hoch ◽  
S L Sinnett ◽  
T H McGavack
Keyword(s):  
Sulfuric Acid ◽  
Sulfate Reduction ◽  
Perchloric Acid ◽  
Healthy Subjects ◽  
Test Sample ◽  
Chloric Acid ◽  
Total Serum ◽  
Acid Digestion ◽  
Reduction Test

Abstract The chloric acid digestion of serum, followed by the ceric sulfate reduction test for iodine has been shown to give results reproducible to within ± 0.00035 µg. iodine per test sample (1) if the entire digestion tubes are kept hot during the combustion step so that products of incomplete oxidation are vaporized, (2) if the perchloric acid and sulfuric acid concentrations in the final digest are adjusted to 1.64 normal (16.5%) and 0.37 normal, respectively, (3) if attention is paid to the order of addition of the reagents, and (4) if the arsenite reagent is added within a fraction of a second. The method gave values for total serum iodine in 20 healthy subjects between 5 and 10.5 µg./100 ml.

Comparison of Sample Preparation Methods for Phosphorus in Grains and Stock Feeds

1968 ◽  
Vol 51 (4) ◽  
pp. 771-773
Author(s):  
Aaron E Rash
Keyword(s):  
Sample Preparation ◽  
Perchloric Acid ◽  
Sodium Molybdate ◽  
The Other ◽  
Acid Digestion ◽  
Preparation Methods ◽  
Commercial Feeds ◽  
Sample Preparation Methods ◽  
Good Agreement

Abstract The nitric-perchloric acid digestion, 22.070(b) and 22.073, for the determination of phosphorus in grains and stock feeds was compared with three other methods of sample preparation (destruction of organic material) : quinoline molybdate precipitation, perchloric-sulfuric-sodium molybdate digestion, and the plant method. The values obtained by the nitric-perchloric acid method were not in good agreement with those obtained by the other methods studied. Six samples of commercial feeds and one barley sample were analyzed. The barley sample gave very poor recoveries by method 22.073.

Atomic Absorption Spectrometric Determination of Cyhexatin in Apples

1978 ◽  
Vol 61 (3) ◽  
pp. 627-628 ◽  
Author(s):  
John L Love ◽  
John E Patterson
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Rapid Method ◽  
Absorption Spectrometry ◽  
Acid Digestion ◽  
Atomic Absorption Spectrometric

Abstract A rapid method using atomic absorption spectrometry has been developed for determining residues of cyhexatin in apples. Each analysis takes less than 30 min and the method is sensitive to less than 0.1 mg cyhexatin/kg. Recoveries varied from approximately 100% at 0.25 and 0.05 mg/kg to 70% at 5 mg/kg. No acid digestion or cleanup is required for the analysis.

Determination of Lead in Bonemeal by Differential Pulse Anodic Stripping Voltammetry Using a Hydrochloric Acid Solubilization

1983 ◽  
Vol 66 (4) ◽  
pp. 985-988
Author(s):  
R Duane Satzger ◽  
Roy W Kuennen ◽  
Fred L Fricke
Keyword(s):  
Hydrochloric Acid ◽  
Rapid Method ◽  
Perchloric Acid ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Anodic Stripping ◽  
The Mean

Abstract A safe, rapid method is described for the determination of lead in bonemeal. This method uses a hydrochloric acid solubilization performed under pressure followed by determination by differential pulse anodic stripping voltammetry. This provides an alternative to a nitric-perchloric acid wet ash. Data obtained using both methods are compared. The mean recovery of a standard Pb spike was 99.2 ± 1%. The concentration of Pb in bonemeal ranged from 1.0 to 15.6 μg/g.

Determination of Calcium in Urine by the Chloranilate Method

1965 ◽  
Vol 11 (9) ◽  
pp. 855-861
Author(s):  
William W Webster ◽  
William H Kern
Keyword(s):  
Perchloric Acid ◽  
Sampling Error ◽  
Urinary Calcium ◽  
Acid Digestion ◽  
Oxalate Precipitation ◽  
Acceptable Method

Abstract Evidence is presented that the colorimetric chloranilate calcium method can be accurately applied to urine provided that elimination of interfering substances, which include magnesium, is performed prior to the determination. Isolation of calcium as the oxalate, followed by perchloric acid digestion, has been shown to be an acceptable method whereby urinary calcium can be put in a suitable state for analysis. Allowing the urine to stand for 1 hr. at pH 2 prior to the oxalate precipitation has been shown to be a simple means of eliminating the sampling error due to calcium precipitates.

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