Humic acids in bottom sediments of the Western Pacific

Elemental composition, functional groups, and molecular mass distribution were determined in humic acids from the Western Pacific abyssal and coastal bottom sediments. Humic acid structure was studied by oxidative degradation with alkaline nitrobenzene and potassium permanganate, p-coumaric, guaiacilic, and syringilic structural units typical for lignin of terrestrial plants were identified in humic acids by chromatographic analysis of oxidation products. Polysubstituted and polycondensed aromatic systems with minor proportion of aliphatic structures were basic structural units of humic acids in abyssal sediments.

(Table 2) Composition of polycyclic aromatics in bottom sediments from the Weddell Sea

Distribution, composition and genesis of organic matter in recent bottom sediments of the Weddell Sea (Western Antarctic) are discussed. Geochemical background levels of bitumen, organic matter, and polycyclic aromatics in the sediments are respectively 0.01-0.1%, 0.003-0.005%, and 0.0001-0.0002%. Deviations from the background level, probably caused by secondary processes, are found. Organic matter has characteristic properties resulting from distinctive character of aquatic biota organic matter, from which it has been formed.

Health assessment document for 1, 1, 1-Trichloroethane (methyl chloroform) : final report.

Mode of access: Internet.

Procedures for controlling the effect of increased tire pressure on asphalt concrete pavement damage. Final report.

Oregon Department of Transportation, Salem

Ambient water quality criteria for chloroform /

Mode of access: Internet.

Response of asphalt concrete pavements to dynamic truck loads. Final report.

California Department of Transportation, Sacramento

Criteria for a recommended standard; occupational exposure to chloroform.

Spine title: Occupational exposure to chloroform.

Royal Cemetery, PG779, excavated artifact, #U.11164, Standard of Ur, both sides

Ur (deserted settlement), Iraq; shell, lapis lazuli, red limestone; set in bitumen

Royal Cemetery, PG779, excavated artifact, #U.11164, Standard of Ur, front, War side

Ur (deserted settlement), Iraq; 8 1/2 in. x 1 ft. 7 1/2 in8 1/2 in. x 1 ft. 7 1/2 in.; shell, lapis lazuli, red limestone; set in bitumen

Royal Cemetery, PG779, excavated artifact, #U.11164, Standard of Ur, front, War side

Ur (deserted settlement), Iraq; shell, lapis lazuli, red limestone; set in bitumen

Royal Cemetery, PG779, excavated artifact, #U.11164, Standard of Ur, rear, Aftermath of the Victorius Battle

Ur (deserted settlement), Iraq; 8 1/2 in. x 1 ft. 7 1/2 in.; shell, lapis lazuli, red limestone; set in bitumen