Methods of test for petroleum and its products. Liquefied petroleum gases. Detection of hydrogen sulfide. Lead acetate method

2015 ◽  
Keyword(s):  
Hydrogen Sulfide ◽  
Lead Acetate ◽  
Sulfide Lead

Modification of the Carbon Disulfide Evolution Method for Dithiocarbamate Residues

1969 ◽  
Vol 52 (1) ◽  
pp. 162-167 ◽  
Author(s):  
George E Keppel
Keyword(s):  
Hydrogen Sulfide ◽  
Hydrochloric Acid ◽  
Carbon Disulfide ◽  
Lead Acetate ◽  
Stannous Chloride ◽  
Acetate Solution ◽  
Colorimetric Measurement ◽  
Fungicide Residues ◽  
Mineral Acids ◽  
Lead Acetate Solution

Abstract A study was made of the analytical method for dithiocarbamate fungicide residues based on decomposition by hot mineral acids to the amine and carbon disulfide and colorimetric measurement of the carbon disulfide. Increased recoveries are obtained by the following modifications: adding a reducing agent (stannous chloride) to the sample before treatment with hot acid; svibstituting diluted sodium hydroxide for lead acetate solution to remove hydrogen sulfide and other interferences; and using boiling diluted hydrochloric acid. With these modifications, recoveries of N,N-dimethyldithiocarbamates from crops ranged from 85.3 to 103.8% (average 94.7%). Ethylenebisdithiocarbamates, with the exception of zineb (range 89.1–96.8%, average 92.0%), gave appreciably lower recoveries, indicating further study is necessary.

Spot Test Reaction for the Detection of Elemental Sulfur

1956 ◽  
Vol 29 (3) ◽  
pp. 1117-1118 ◽  
Author(s):  
Fritz Feigl ◽  
Cecile Stark
Keyword(s):  
Hydrogen Sulfide ◽  
Lead Acetate ◽  
Elemental Sulfur ◽  
Test Tube ◽  
Spot Test ◽  
Sensitive Test ◽  
Test Reaction ◽  
Commercial Products ◽  
Inorganic Substances ◽  
Free Sulfur

Abstract Hydrogen sulfide is formed when free sulfur is heated with fused benzoin. This is the basis of a new and sensitive test for free sulfur in mixtures with organic or inorganic substances. The heating is done in a test-tube, whose mouth carries lead acetate paper. The limit of identification is 0.5µ. Selenium does not interfere. Tests of a wide variety of commercial products gave satisfactory results.

Nanocrystalline cellulose mediated seed-growth for ultra-robust colorimetric detection of hydrogen sulfide

Nanoscale ◽  
2017 ◽  
Vol 9 (28) ◽  
pp. 9811-9817 ◽  
Author(s):  
Yuexiao Jia ◽  
Yongming Guo ◽  
Shiwen Wang ◽  
Wenwen Chen ◽  
Jiangjiang Zhang ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Lead Acetate ◽  
Low Cost ◽  
Colorimetric Detection ◽  
Nanocrystalline Cellulose ◽  
Cost Approach ◽  
Seed Growth

We describe an ultra-stable, ultra-robust, straightforward and low-cost approach for the colorimetric detection of H2S with nanocrystalline cellulose (NCC) based on the reaction of H2S with lead acetate.

scholarly journals Plasma Hydrogen Sulfide Production Capacity is Positively Associated with Post-Operative Survival in Patients Undergoing Surgical Revascularization

2021 ◽  
Author(s):  
Alban Longchamp ◽  
Michael R. MacArthur ◽  
Kaspar Trocha ◽  
Janine Ganahl ◽  
Charlotte G. Mann ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Vascular Surgery ◽  
Vascular Disease ◽  
Lead Acetate ◽  
Production Capacity ◽  
Atherosclerotic Disease ◽  
List Type ◽  
Surgical Revascularization ◽  
Post Surgery ◽  
Release Method

ABSTRACTObjectiveHydrogen sulfide (H2S) is a gaseous signaling molecule and redox factor important for cardiovascular function. Deficiencies in its production or bioavailability are implicated in atherosclerotic disease. However, it is unknown if circulating H2S levels differ between vasculopaths and healthy individuals, and if so, whether H2S measurements can be used to predict surgical outcomes. Here, we examine: 1) Plasma H2S levels in patients undergoing vascular surgery and compare these to healthy controls, and 2) Associations between H2S levels and mortality in surgical revascularization patients.Approach & ResultsPatients undergoing carotid endarterectomy, open lower extremity revascularization or leg amputation were enrolled. Peripheral blood was also collected from a matched cohort of 20 patients without peripheral or coronary artery disease. Plasma H2S production capacity and sulfide concentration were measured using the lead acetate and monobromobimane methods, respectively. Plasma H2S production capacity and plasma sulfide concentrations were reduced in patients with PAD (p<0.001, p=0.013 respectively). Patients that underwent surgical revascularization were divided into high versus low H2S production capacity groups by median split. Patients in the low H2S production group had increased probability of mortality (p=0.003). This association was robust to correction for potentially confounding variables using Cox proportional hazard models.ConclusionsCirculating H2S levels were lower in patients with atherosclerotic disease. Patients undergoing surgical revascularization with lower H2S production capacity, but not sulfide concentrations, had increased probability of mortality within 36 months post-surgery. This work provides insight on the role H2S plays as a diagnostic and potential therapeutic for cardiovascular disease.HIGHLIGHTSVascular disease patients have higher plasma hydrogen sulfide levels than controls without vascular disease as measured by two distinct methods, the lead acetate hydrogen sulfide release method and the HPLC-based monobromobimane method.Only the lead acetate hydrogen sulfide release method robustly predicts survival after vascular surgery intervention over 35 months of follow up.The lead acetate release method measures non-enzymatic hydrogen sulfide release from plasma which requires iron and is catalyzed by vitamin B6.

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