nanogram per liter
The nanogram per litre is 10⁻¹⁰ percent, one part per trillion in dilute water. It is the reporting unit for PFAS, pharmaceuticals and endocrine disruptors in water supplies; the 2024 US drinking water limits for PFOA and PFOS are 4 ng/L.
Watch out: At nanogram-per-litre levels the sampling equipment is a bigger problem than the analysis. PFAS in particular are found in tubing, container caps and even in some laboratory water, so a positive result at this level means nothing without matching field and laboratory blanks.
| 1 | 1.0000000e-10 |
One nanogram per liter in every concentration unit
| 1 | part per trillion (ppt) | |
| 1 | nanogram per liter (ng/L)this unit | |
| 0.001 | parts per billion (ppb) | |
| 0.001 | microgram per liter (μg/L) | |
| 0.000001 | parts per million (ppm) | |
| 0.000001 | part per million by volume (ppmv) | |
| 0.000001 | milligram per kilogram (mg/kg) | |
| 0.000001 | milligram per liter (mg/L) | |
| 5.84180e-08 | grain per US gallon (as CaCO₃) (gpg) | |
| 1.00000e-09 | part per thousand (ppth) | |
| 1.00000e-09 | gram per liter (g/L) | |
| 1.00000e-10 | percent (%) | |
| 1.00000e-10 | percent by weight (% w/w) | |
| 1.00000e-10 | percent by volume (% v/v) | |
| 1.00000e-10 | percent weight per volume (% w/v) | |
| 1.00000e-12 | fraction (0–1) (fraction) |
Solvers that use concentration