Arsenic tests

Arsen-oxyd, n, arsenic oxide, specif, arsenic trioxide, arsemc(III) oxide. -pra parat, n, arsenical preparation, arsenical, -probe, /, arsenic test or sample, -rohr, n, -rShre, /. arsenic tube, -rotgultigerz, n. proustite. -rubin, m. realgar, -salz, n. arsenic salt, arsensauer, a. of or combined with arsenic acid, arsenate of,... 

The literature emphasizes that arsenic metabolism and toxicity vary greatly between species and that its effects are significantly altered by numerous physical, chemical, and biological modifiers. Adverse health effects, for example, may involve respiratory, gastrointestinal, cardiovascular, and hematopoietic systems, and may range from reversible effects to cancer and death, depending partly on the physical and chemical forms of arsenic tested, the route of administration, and the dose. 

Eyster R.F, Davis, OSRD Rept 5744(1945) (One type of Drop-Weight Impact Machine developed in the US during WWII) 3) Ohart (1946), 48-9, 96, 131-32, 210 380-81 4) Anon, 11 Picatinny Arsenal Testing Manual", No 2—2 (1951), p 3 5) Glossary of... 

Ordnance Proof Manual, OPM 40 23 (1947) Aberdeen Proving Ground, Md 3)J.H.McIvor, Picatinny Arsenal Testing Manual, No 5-1 (1950) 4)PATR 2510 (1958), pGer 52 5)Glossary of Ord (1959), 73 6)PATR 2700 Vol 1 (I960), pXII... 

Tuinhof, A. and Nanni, M. (2003) Arsenic Testing and Finalization of Groundwater Legislation, Nepal, World Bank Group. 

S. M. Gerber and R. Saferstein, eds, More Chemistry and Crime From Marsh Arsenic Test to DNA Profile, American Chemical Society, Washington DC, 1997. 

Lead Determine as directed under Lead Limit Test, Appendix IIIB, using a 10.0-mL portion of the solution prepared under Arsenic Test, above, and 10 pig of lead (Pb) ion in the control. 

Apparatus For sample digestion, use the microwave apparatus as described for Apparatus in the Arsenic test (above). For sample analysis, see Apparatus for Method I in the Atomic Absorption Spectrophotometric Graphite Furnace Method under Lead Limit Test, Appendix IIIB. 

Sample Preparation Prepare as directed for Sample Preparation in the Arsenic test (above). 

Arsenic Determine as directed under Arsenic Limit Test, Appendix IIIB, using 3.0 mL of Sample Solution, prepared as follows Transfer 10.0 g of sample into a 250-mL beaker, add 50 mL of 0.5 N hydrochloric acid, cover with a watch glass, and heat at 70° for 15 min. Cool, and decant through Whatman No. 3, or equivalent, filter paper into a 100-mL volumetric flask. Wash the slurry with three 10-mL portions of hot water and the filter paper with 15 mL of hot water, dilute the solution to volume with water, and mix. Retain a 10.0-mL portion of this solution for the Lead test (below). Lead Determine as directed under Lead Limit Test, Appendix IIIB, using a 10.0-mL portion of the solution prepared in the Arsenic test (above), and using 10 jxg of lead (Pb) ion in the control. 

Assay Dissolve about 600 mg, accurately weighed, in 40 mL of water, and titrate to a pH of 4.6 with 0.1 A sulfuric acid. Each mL of 0.1 A sulfuric acid is equivalent to 13.21 mg of (NH4)2HP04. Arsenic A solution of 1 g in 35 mL of water meets the requirements of the Arsenic Test, Appendix IIIB. 

Arsenic A solution of 1 g in 35 mL of water meets the requirements of the Arsenic Test, Appendix IIIB. 

Assay Transfer about 5 g of the sample, previously dried at 105° for 4 h and accurately weighed, into a 250-mL beaker, add 100 mL of water and 5.0 mL of 1A hydrochloric acid, and stir until the sample is completely dissolved. Place the electrodes of a suitable pH meter in the solution, and slowly titrate the excess acid, stirring constantly, with 1 N sodium hydroxide to the inflection point occurring at about pH 4. Record the buret reading, and calculate the volume (A), if any, of 1 A hydrochloric acid consumed by the sample. Continue the titration with 1 A sodium hydroxide until the inflection point occurring at about pH 8.8 is reached, record the buret reading, and calculate the volume (II) of 1 A sodium hydroxide required in the titration between the two inflection points (pH 4 and pH 8.8). Each mL of the volume B A of 1 A sodium hydroxide is equivalent to 136.1 mg of KH2PO4. Arsenic A solution of 1 g in 10 mL of water meets the requirements of the Arsenic Test, Appendix IIIB. 

Assay Dissolve about 500 mg, accurately weighed, in 100 mL of water in a 400-mL beaker. Using a pH meter, adjust the pH of the solution to 3.8 with hydrochloric acid, then add 50 mL of a 1 8 solution of zinc sulfate (125 g of ZnSC>4.7H20 dissolved in water, diluted to 1000 mL, filtered, and adjusted to pH 3.8), and allow to stand for 2 min. Titrate the liberated acid with 0.1 A sodium hydroxide until a pH of 3.8 is again reached. After each addition of 0.1 A sodium hydroxide near the endpoint, allow time for any precipitated zinc hydroxide to redissolve. Each mL of 0.1 A sodium hydroxide is equivalent to 11.10 mg of Na2H2 207. Arsenic A solution of 1 g in 10 mL of water meets the requirements of the Arsenic Test, Appendix IRB. 

Arsenic Specifications Policy, 2 Arsenic Test, 755 Ascorbic Acid, 33 l-Ascorbic Acid, 33 Ascorbyl Palmitate, 34 Ash (Acid-Insoluble), 748 Ash (Total), 748 L-Asparagine, 35 Aspartame, 35, (Sl)4 Aspartame-Acesulfame Salt, (S3)5, 96 dl-Aspartic Acid, 36, (S3)7 l-Aspartic Acid, 37, (S2)l, (S3)7 L-a-Aspartyl-2-methyl ester Compound with 6-Methyl-l,2,3-oxathiazin-4(3H)-one 2,2-Dioxide (1 1), (S3)5 A-L-a-Aspartyl-L-phenylalamnc 1-Methyl Ester, 35, (S1 )4... 

For the Test Preparation, 35 ml of the water from one Type I glass container or, in the case of smaller containers, 35 ml of the combined contents of several Type I glass containers is used and prepared as directed for Procedure under Water Attack at 121°C and the procedure described for arsenic test in USP 29-NF 24 general chapter <211> Arsenic is then followed. The limit provided for this test is 0.1 ppm. ... 

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