Parts per Trillion

Known as: Part Per Trillion, [pptr], pptr 
A unit of proportion equal to 10E-12.
National Institutes of Health

Papers overview

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2012
2012
A sensitive spectroscopic sensor based on a hollow-core fiber-coupled quantum cascade laser (QCL) emitting at 10.54 μm and quartz… (More)
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2011
2011
Radiocarbon ((14)C) concentrations at a 43 parts-per-quadrillion level are measured by using saturated-absorption cavity ringdown… (More)
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Highly Cited
2011
Highly Cited
2011
Atmospheric aerosols exert an important influence on climate through their effects on stratiform cloud albedo and lifetime and… (More)
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2009
2009
We determine the sensitivity of several commercial atmospheric pressure ionization mass spectrometers towards ambient vapors… (More)
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2009
2009
In the current study, organophosphate and pyrethroid insecticides including diazinon, chlorpyrifos, bifenthrin, fenpropathrin… (More)
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2008
2008
δ13C values of a suite of halocarbons have been determined in an urban background site in Bristol, UK. A novel mobile… (More)
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2004
2004
Spectroscopic detection of ethane in the 3-microm wavelength region was performed by means of a cw optical parametric oscillator… (More)
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2001
Highly Cited
2001
The first U.S. nationwide food sampling with measurement of dioxins, dibenzofurans, and coplanar, mono-ortho and di-ortho… (More)
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1997
Highly Cited
1997
We studied diabetes mellitus and glucose and insulin levels in Air Force veterans exposed to Agent Orange and its contaminant, 2… (More)
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1979
Highly Cited
1979
Ahtract--The sorption of hydrophobic compounds (aromatic hydrocarbons and chlorinated hydrocarbons) spanning a concentration… (More)
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