Collaborative Study of Modified Elmore Method for Mercury in Formulations

1971 ◽  
Vol 54 (3) ◽  
pp. 685-687
Author(s):  
James E Launer
Keyword(s):  
Standard Deviation ◽  
Systematic Error ◽  
Random Error ◽  
Collaborative Study ◽  
Test Pair ◽  
Titrimetric Method ◽  
Mercuric Nitrate ◽  
Thiocyanate Solution ◽  
Diluted Solution ◽  
Bearing Materials

Abstract The titrimetric method for mercury described by Elmore in 1946 was modified and collaboratively studied with formulations containing 6.7% phenylmercury urea in one test pair and 1% mercuric nitrate in another test pair. Mercury is determined in diluted solution, following reflux at 30 drops/min with fuming H2SO4-red fuming HNO3, by titration with standard thiocyanate solution, using ferric alum as indicator. The method is not applicable in presence of large quantities of chlorine-bearing materials. Single determinations on 4 samples by 14 collaborators showed that the standard deviation estimation of random error was 0.058 for phenylmercury urea and 0.004 for mercuric nitrate. Standard deviation estimates of systematic error were 0.048 and 0.009, respectively. The method has been adopted as official first action.

Synthesis of [203Hg]methyl mercuric nitrate

1969 ◽  
Vol 5 (2) ◽  
pp. 152-155 ◽  
Author(s):  
M. C. Cullen ◽  
E. T. McGuinness
Keyword(s):  
Mercuric Nitrate

Mercuration of Benzene with Mercuric Nitrate

1947 ◽  
Vol 69 (4) ◽  
pp. 908-911 ◽  
Author(s):  
Avery A. Morton ◽  
Robert R. Marshall ◽  
Richard E. Alden ◽  
Eugene E. Magat
Keyword(s):  
Mercuric Nitrate

279. The estimation of lactose in milk

1941 ◽  
Vol 12 (2) ◽  
pp. 131-138 ◽  
Author(s):  
A. K. R. McDowell
Keyword(s):  
Reduction Method ◽  
Phosphotungstic Acid ◽  
Sugar Content ◽  
Zinc Hydroxide ◽  
Mercuric Nitrate ◽  
Milk Sugar ◽  
Chloramine T ◽  
Good Agreement

1. The direct volumetric copper reduction method of estimation of lactose in unclarified milk gives results which are in good agreement with those on the same milk clarified and decalcified.2. For the polarimetric' or iodometric methods of estimation of lactose the milk is best clarified with either zinc hydroxide or cadmium hydroxide. Clarification with acid mercuric nitrate or phosphotungstic acid for the polarimetric method and with dialysed iron or phosphotungstic acid for the iodometric method gives high results owing to failure to remove interfering substances.3. Dialysed iron, phosphotungstic acid, cadmium hydroxide or zinc hydroxide are all suitable for deproteinizing the milk for the chloramine-T method of estimation of lactose.4. The values for lactose content of milk as estimated by the above methods show good agreement and therefore may be accepted as the true milk sugar content.

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