Determination of Free Sodium Cyanide and Ammonia in Brass Plating Solutions

1938 ◽  
Vol 10 (12) ◽  
pp. 698-701 ◽  
Author(s):  
Samuel Heiman ◽  
Wallace M. McNabb
Keyword(s):  
Sodium Cyanide ◽  
Brass Plating

Determination of Pb2+ in Wastewater by Lead(II)-dithizone-xylenol Orange Tenary Complex Spectrophotometry

2014 ◽  
Vol 1030-1032 ◽  
pp. 301-304 ◽  
Author(s):  
Jian Qi Sun
Keyword(s):  
Standard Deviation ◽  
Ph Value ◽  
Xylenol Orange ◽  
Direct Determination ◽  
Sodium Cyanide ◽  
Relative Standard ◽  
Efficient Recovery ◽  
Wastewater Samples ◽  
Orthogonal Tests

An novel Lead (II)-dithizone-xylenol orange tenary complex spectrophotometry was developed for the determination of Pb2+ in wastewater. For this purpose, the parameters of spectrophotometry such as the detection wavelength, pH value, the dosage of dithizone-xylenol orange and reaction time were studied and optimized through orthogonal tests. The method was linear in the ranges from 2.1×10-3 to 6.0 μg·mL-1 for Pb2+ with R2≥ 0.999. The procedure allowed efficient recovery of the investigated Pb2+ ranging between 95 % and 103 % with a relative standard deviation (RSD) ≤ 2.1 for actual wastewater samples spiked with 1.00, 2.00 and 3.00 μg·mL-1 of standard Pb2+, respectively. These results show the method can be applied to the direct determination of Pb2+ in wastewater, avoiding the use of toxic extrant (chloroform) and masking reagent (sodium cyanide) in the traditional methods and time-consuming procedures, moreover, the investigated method is simple, accurate, reliable, and inexpensive, which implies the potential of this technique for Pb2+ monitoring in wastewater samples.

Analysis of free sodium cyanide in brass plating solutions

1940 ◽  
Vol 12 (3) ◽  
pp. 161-163 ◽  
Author(s):  
Wallace M. McNabb ◽  
Samuel Heiman
Keyword(s):  
Sodium Cyanide ◽  
Brass Plating

Determination of Zinc in Cyanide Brass-Plating Baths

1944 ◽  
Vol 16 (3) ◽  
pp. 165-166 ◽  
Author(s):  
A S. MICELI ◽  
I O. LARSON
Keyword(s):  
Brass Plating

scholarly journals Radiochemical micro assays for the determination of choline acetyltransferase and acetylcholinesterase activities

1969 ◽  
Vol 115 (3) ◽  
pp. 465-472 ◽  
Author(s):  
F. Fonnum
Keyword(s):  
Brain Tissue ◽  
Choline Acetyltransferase ◽  
Sodium Cyanide ◽  
Acetyl Coa ◽  
Acetyltransferase Activity ◽  
Sodium Tetraphenylboron ◽  
Pigeon Liver ◽  
Choline Acetyltransferase Activity

1. The methods for the assay of choline acetyltransferase were based on the reaction between labelled acetyl-CoA and unlabelled choline to give labelled acetylcholine. 2. Both synthetic acetyl-CoA and acetyl-CoA formed from sodium [1−14C]acetate or sodium [3H]acetate by incubation with CoA, ATP, Mg2+ and extract from acetone-dried pigeon liver were used. 3. [1−14C]Acetylcholine was isolated by extraction with ketonic sodium tetraphenylboron. 4. [3H]Acetylcholine was precipitated with sodium tetraphenylboron to remove a ketone-soluble contaminant in sodium [3H]acetate and then extracted with ketonic sodium tetraphenylboron. 5. The values of choline acetyltransferase activity obtained in the presence of sodium cyanide or EDTA and synthetic acetyl-CoA were similar to those obtained with acetyl-CoA synthesized in situ. 6. The assay of acetylcholinesterase was based on the formation of labelled acetate from labelled acetylcholine. The labelled acetylcholine could be quantitatively removed from the acetate by extraction with ketonic sodium tetraphenylboron. 7. The methods were tested with samples from central and peripheral nervous tissues and purified enzymes. 8. The blank values for choline acetyltransferase and acetylcholinesterase corresponded to the activities in 20ng. and 5ng. of brain tissue respectively.

The structure, synthesis, analysis, and occurrence of 3-deoxy-D-manno-octulosonic acid

1969 ◽  
Vol 47 (7) ◽  
pp. 691-695 ◽  
Author(s):  
D. T. Williams ◽  
M. B. Perry
Keyword(s):  
Quantitative Determination ◽  
Good Yield ◽  
Chromatographic Analysis ◽  
Chromatographic Method ◽  
Sodium Cyanide ◽  
Direct Products ◽  
Gram Negative ◽  
Structure Synthesis ◽  
Gas Chromatographic Method

The structure of 3-deoxy-D-manno-octulosonic acid was confirmed by its reduction to 3-deoxy-D-glycero-D-galacto-octonic acid and 3-deoxy-D-glycero-D-talo-octonic acid which were identified by comparison with authentic acids. 3-Deoxy-D-manno-octulosonic acid was synthesized in good yield by the oxidation of 3-deoxy-D-glycero-D-galacto-octonic acid and 3-deoxy-D-glycero-D-talo-octonic acid prepared by the action of sodium cyanide on 2-deoxy-D-manno-heptose.A method has been developed for the quantitative determination of 3-deoxy-D-manno-octulosonic acid, involving gas chromatographic analysis of the direct products of trimethylsilylation using bis-(trimethylsilyl)trifluoroacetamide for its conversion to volatile stable derivatives. The gas chromatographic method has been used for the identification of 3-deoxy-D-manno-octulosonic acid in several gram-negative bacterial lipopolysaccharide preparations.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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