at sub-ppb level
1Parts-per notation — One part per trillion (1 ppt) is a proportion equivalent to one twentieth of a drop of water diluted into an Olympic size swimming pool. In science and engineering, the parts per notation is a set of pseudo units to describe small values of… …
2AutoAnalyzer — is an automated analyzer using a special flow technique named continuous flow analysis (CFA) first made by the Technicon Corporation. The instrument was invented 1957 by Leonard Skeggs, PhD and commercialized by Jack Whitehead s Technicon… …
3global warming — an increase in the earth s average atmospheric temperature that causes corresponding changes in climate and that may result from the greenhouse effect. [1975 80] * * * Potential increase in global average surface temperatures resulting from… …
4Mountain yellow-legged frog — Conservation status Endangered (IUCN 3 …
5Formaldehyde — For other uses, see Formaldehyde (disambiguation). Formaldehyde …
6Norman, Oklahoma —   City   …
7Geology of Mars — Mars   Mars as seen by the Hubble Space Telescope Designations …
8Columbia, Maine —   Town   …
9Imidacloprid — Imidacloprid[1] …
10Geography of Sheffield — Sheffield is the most geographically diverse city in Englandref|GEO. The city nestles in a natural amphitheatre created by a number of hills and the confluence of five rivers: Don, Sheaf, Rivelin, Loxley and Porter. As such, much of the city is… …
