Arsonates chemistry

Both arsonic and arsinic acids give precipitates with many metal ions, a property which has found considerable use in analytical chemistry. Of particular importance are certain a2o dyes (qv) containing both arsonic and sulfonic acid groups which give specific color reactions with a wide variety of transition, lanthanide, and actinide metal ions. One of the best known of these dyes is... 

The chemistry of cassiterite flotation has been a subject of considerable research for many years. The findings that sulphosuccinamates, phosphonic acid and arsonic acid were selective collectors for cassiterite flotation lead to the introduction of flotation as a complementary recovery process to gravity concentration at most primary tin mill concentrators in the early 1970s. In spite of continued research, subsequent progress in development has been rather limited. Cassiterite flotation still remains a secondary tin recovery process in most plants, for beneficiation of cassiterite below 40 pm size. 

Some relevant chemistry of arsonic acids is given. 

Dixon, H.B.F. (1997) The biochemical action of arsonic acids especially as phosphate analogues. Advances in Inorganic Chemistry, 44, 191-227. 

In the third quarter, we plan to offer a course which includes the presentation of expert witness testimony in a mock court of law with the assistance of the Northeastern University Law School. Practice trial sessions with student attorneys are envisioned. The course on arson and explosives will deal with detection of related crimes, and biometrics in the fifth quarter will cover concepts of statistics important in forensic chemistry. 

To learn more about forensics, visit the Chemistry Web site at chemistrymc.com Activity Choose one brand of forensic investigation, such as arson, anthopology, firearms, or toxicology, and report on the elements that provide the most important clues to investigators. 

Arson by electronics may be presumed to be of an inherently more elaborate nature than conventional arson. It also follows that the criminal himself may be expected to be of a more intelligent and more highly educated type. It is true that a portion of the people employed by the electronics industry arc purely theoreticians and therefore do not necessarily possess the practical ability to implement such plans, but many of them are craftsmen, not only in electronics, but in allied arts such as chemistry, physics, and machine tool practices. In these cases it would be unnecessary for them to acquire outside help, thus restricting intimate knowledge of the offense to a minimum number of persons. 

Jack Hubball is a lead criminalist with the Connecticut State Police Forensic Laboratory. The Chemistry Section of the laboratory provides analyses for organic compounds from a variety of samples submitted from crime scenes. However, the majority of samples are from suspect-arson fire scenes. Many of these samples contain pyrolysis products and/or polymer additives. During his tenure at the Forensic Laboratory, Dr. Hubball has analyzed more than 10,000 items. In addition to his duties as an analyst, he is the quality manager for the Forensic Laboratory and is responsible for most aspects of the lab QA/QC program. He is the laboratory representative to the Connecticut State Police K-9 Unit and provides final testing and third party certification for the accelerant, drug and explosives detection teams. 

The synthesis of arsonic acids by the Bart reaction is a domain of classical arsenic chemistry (Section 6.26.4.1.3.1.1), for example (22) (23) (Scheme 2) <22LA(429)55> (see also <1863CR(56)1172, 21CB438, 25BRP261026)). 

According to organic chemistry, the structures of various phosphonic acids and arsonic acids can be given as follows ... 

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