Investigation into the determination of arsenic by direct current plasma atomic emission spectrometer

Improvements have been made on the currently available hydride generator system manufactured by SpectraMetrics Incorporated, because the system was found to be unsatisfactory with respect to the following: 1. the drying agent, anhydrous calcium chloride, 2. the special sample tube, 3. the direction of argon flow through the Buchner funnel when it came to dealing with real sample, that is, with reference only to aqueous extracts of soil samples. Changes that were made on the system included the replacement of anhydrous calcium chloride with anhydrous calcium sulphate and the replacement of the special sample tube with a modified one made from silica. Re-directing the flow of argon through the top of the Buchner funnel appeared to make the system compatible with aqueous extracts of soil samples. The interferences from 1000 ~g/mL of nickel(II) , cobalt(II), iron(III), copper(II) have been eliminated with the aid of 1.4 M hydrochloric acid and 1% (weight/volume) L-cystine. Greater than 90% recovery of 0.3 ~g/mL arsenic signal was achieved in each case. Furthermore, 103% of arsenic signal was accomplished in the presence of 1000 ~g/mL cadmium with 5 M Hel. tVhen each of the interferents was present in solution at 1000 ppm, a recovery of 85% was achieved by using 5 M hydrochloric acid and 3% (weight/volume) L-cystine. Without L-cystine and when 1.4 M hydrochloric acid was used, the recoveries were 0% (Ni), 0% (Co), 88% (Fe), 15% (Cu), 18% (Cd). Similarly, a solution containing 1000 ppm of each interferent gave a zero percent recovery of arsenic. The reduction of trivalent and pentavalent arsenic at a pH less than one has also been investigated and shown to be quantitative if peak areas are measured. The reproducibility determination of a 0.3 Vg/mL standard arsenic solution by hydride generation shows a relative standard deviation of 3.4%. The detection limits with and without Porapak Q have been found to be 0.6 ng/mL and 1.0 ng/mL, respectively.

Sketch of Charles Clarke Chapman

Photographic copy of a portrait sketch of Charles C. Chapman in the Chapman College president's office, Orange, California

Home of Charles Clarke Chapman, Fullerton, California, 1914

Home of Charles Clarke Chapman, Fullerton, California, 1914.

Formal garden of Charles C. Chapman, Fullerton, California, 1914

Formal garden of Charles C. Chapman, Fullerton, California. Photograph taken on day of garden party, September 5, 1914.

Home of Charles Clarke Chapman, Fullerton, California

Home of Charles Clarke Chapman, Fullerton, California. Photographic postcard with "Faculty parties in May each year 1933-1940" written on back.

Formal garden of the Charles C. Chapman home, Fullerton, California

Formal garden of the Charles C. Chapman home, Fullerton, California, in the 1920s.

Office of Charles C. Chapman, Los Angeles, California

Office of Charles C. Chapman, Los Angeles, California.

The wars of the gulls; : an historical romance in three chapters; chap. I, Shewing how and why and with whom the gulls went to war: chap. II, Shewing how the gulls make the deep to boil like a pot: chap. III, Shewing how a certain doughty general of the gulls goes forth to play the game of hull-gull in Upper Canada.

Transcribed on front paste-down: W.G. Phelps Oct. 29 1890.

Photograph of Charles Bell with Horse and Cart, St. Catharines [n.d.]

Charles Bell is pictured in this black and white undated photograph with his horse and cart. Mr. Bell ran an ice and coal business on Geneva St. in St. Catharines, Ontario. This photograph was in the possession of the Rick Bell family, of St. Catharines.Handwritten inscription on the reverse reads: "Grandpa Charles Bell ran ice and coal business, Geneva St. St. Catharines"

Residence of William W. Kitchen & Residence of Charles Kitchen - Vignette

A vignette two homes in Grimsby. There are two homes in the image, one the residence of William W. Kitchen, the second the residence of Charles Kitchen.

Photograph - Charles W. Band, Jessie Shaw Band and a child sitting on the Steps of a House

A photograph of Charles W. Band, Jessie Shaw Band , and a child sitting together on the steps of a house.

Announcement of Birth, Charles Woodruff Band

Announcement of the birth Charles Woodruff Band from Mr. and Mrs. Percy Carruthers Band of Hewlett, Long Island, Nov. 9, 1921.

Lock of Hair - Charles Band

Lock of hair from Charles Band – an envelope within another envelope containing Charles Band’s hair. This is from a haircut for Granny’s anniversary. The writing of the envelope says “Pussy’s hair” Nov. 21, 1922.

Advertisement (printed 1 page) advertising Charles Dwight, agent for The Western Bond Board of Kansas City

Advertisement (printed 1 page) advertising Charles Dwight, agent for The Western Bond Board of Kansas City, 1872, n.d.