Using the Chemical Concentration Conversion Tool
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1. Select the media.
2. Enter parameters for "Air" values. For "Soil" or "Water" values, skip to step 3. 3. Select the desired units. 4. Adjust the molecular weight. 5. Add extra chemical entries. 6. Enter concentration values. 7. Review and export results. |
1. Select the media2. Enter parameters for "Air" values.3. Select the desired units.4. If necessary, adjust the molecular weight of your chemical selection.5. Use the 'plus' and 'minus' buttons for multiple entries of the same chemical.6. Enter concentration values.7. Review and export results. |
| Operation | Equation |
|---|---|
| ppm → ppb → ppt | $$ppm \cdot 1000 = ppb\text{;}\:ppb \cdot 1000 = ppt$$ |
| mg/m3 → ug/m3 → ng/m3 | $$mg/m^3 \cdot 1000 = ug/m^3\text{;}\:ug/m^3 \cdot 1000 = ng/m^3$$ |
| mg/L → ug/L → ng/L → pg/L | $$mg/L \cdot 1000 = ug/L\text{;}\:ug/L \cdot 1000 = ng/L\text{;}\:ng/L \cdot 1000 = pg/L$$ |
| mg/mL → ug/mL → ng/mL → pg/mL | $$mg/mL \cdot 1000 = ug/mL\text{;}\:ug/mL \cdot 1000 = ng/mL\text{;}\:ng/mL \cdot 1000 = pg/mL$$ |
| mg/kg → ug/kg → ng/kg | $$mg/kg \cdot 1000 = ug/kg\text{;}\:ug/kg \cdot 1000 = ng/kg$$ |
| mg/g → ug/g → ng/g | $$mg/g \cdot 1000 = ug/g\text{;}\:ug/g \cdot 1000 = ng/g$$ |
| Operation | Equation |
|---|---|
| % and ppmV | |
| % → ppmV | $$ppmV=\text{Conc}[\%] \cdot 1000[unitless]$$ |
| ppmV → % | $$\%=\frac{\text{Conc}[ppmV]}{1000[unitless]}$$ |
| ppmV and mg/m3 where R is 8.2057 × 10-5 | |
| ppmV → mg/m3 | $$mg/m^3= \frac{\text{Conc}[ppmV] \cdot MW[g/mol] \cdot P_i[atm]}{R [m^3 \cdot atm / (mol \cdot K)] \cdot T_i[K]} \cdot (\frac{T_i[K] \cdot P_f[atm]}{T_f[K] \cdot P_i[atm]})$$ |
| mg/m3 → ppmV | $$ppmV= \frac{\text{Conc}[mg/m^3] \cdot R [m^3 \cdot atm / (mol \cdot K)] \cdot T_i[K]}{MW[g/mol] \cdot P_i[atm]} \cdot (\frac{T_i[K] \cdot P_f[atm]}{T_f[K] \cdot P_i[atm]})$$ |
| mg/L and mg/m3 | |
| mg/L → mg/m3 | $$mg/m^3= \text{Conc}[mg/L] \cdot 1000[L/m^3] \cdot (\frac{T_i[K] \cdot P_f[atm]}{T_f[K] \cdot P_i[atm]})$$ |
| mg/m3 → mg/L | $$mg/L= \frac{\text{Conc}[mg/m^3]}{1000[L/m^3]} \cdot (\frac{T_i[K] \cdot P_f[atm]}{T_f[K] \cdot P_i[atm]})$$ |
| mg/L and ppmV where R is 8.2057 × 10-5 | |
| mg/L → ppmV | $$ppmV= \frac{\text{Conc}[mg/L] \cdot T_i[K] \cdot R [m^3 \cdot atm / (mol \cdot K)] \cdot 1000[L/m^3]}{MW[g/mol] \cdot P_i[atm]} \cdot (\frac{T_i[K] \cdot P_f[atm]}{T_f[K] \cdot P_i[atm]})$$ |
| ppmV → mg/L | $$mg/L= \frac{\text{Conc}[ppmV] \cdot MW[g/mol] \cdot P_i[atm]}{R [m^3 \cdot atm / (mol \cdot K)] \cdot T_i[K] \cdot 1000[L/m^3]} \cdot (\frac{T_i[K] \cdot P_f[atm]}{T_f[K] \cdot P_i[atm]})$$ |
| Operation | Equation |
|---|---|
| % and ppmV | |
| ppmV ← % | $$ppmV=\text{Conc}[\%] \cdot 1000[unitless]$$ |
| % ← ppmV | $$\%=\frac{\text{Conc}[ppmV]}{1000[unitless]}$$ |
| ppmV and mg/m3 where R is 8.2057 × 10-5 | |
| mg/m3 ← ppmV | $$mg/m^3= \frac{\text{Conc}[ppmV] \cdot MW[g/mol] \cdot P_f[atm]}{R [m^3 \cdot atm / (mol \cdot K)] \cdot T_f[K]} \cdot (\frac{T_f[K] \cdot P_i[atm]}{T_i[K] \cdot P_f[atm]})$$ |
| ppmV ← mg/m3 | $$ppmV= \frac{\text{Conc}[mg/m^3] \cdot R [m^3 \cdot atm / (mol \cdot K)] \cdot T_f[K]}{MW[g/mol] \cdot P_f[atm]} \cdot (\frac{T_f[K] \cdot P_i[atm]}{T_i[K] \cdot P_f[atm]})$$ |
| mg/L and mg/m3 | |
| mg/m3 ← mg/L | $$mg/m^3= \text{Conc}[mg/L] \cdot 1000[L/m^3] \cdot (\frac{T_f[K] \cdot P_i[atm]}{T_i[K] \cdot P_f[atm]})$$ |
| mg/L ← mg/m3 | $$mg/L= \frac{\text{Conc}[mg/m^3]}{1000[L/m^3]} \cdot (\frac{T_f[K] \cdot P_i[atm]}{T_i[K] \cdot P_f[atm]})$$ |
| mg/L and ppmV where R is 8.2057 × 10-5 | |
| ppmV ← mg/L | $$ppmV= \frac{\text{Conc}[mg/L] \cdot T_f[K] \cdot R [m^3 \cdot atm / (mol \cdot K)] \cdot 1000[L/m^3]}{MW[g/mol] \cdot P_f[atm]} \cdot (\frac{T_f[K] \cdot P_i[atm]}{T_i[K] \cdot P_f[atm]})$$ |
| mg/L ← ppmV | $$mg/L= \frac{\text{Conc}[ppmV] \cdot MW[g/mol] \cdot P_f[atm]}{R [m^3 \cdot atm / (mol \cdot K)] \cdot T_f[K] \cdot 1000[L/m^3]} \cdot (\frac{T_f[K] \cdot P_i[atm]}{T_i[K] \cdot P_f[atm]})$$ |
| Operation | Equation |
|---|---|
| mg/kg and ppm | |
| mg/kg → ppm | $$ppm=\text{Conc}[mg/kg]$$ |
| ppm → mg/kg | $$mg/kg=\text{Conc}[ppm]$$ |
| mg/g and mg/kg | |
| mg/kg → mg/g | $$mg/g=\text{Conc}[mg/kg] \cdot \frac{1}{1000}[kg/g]$$ |
| mg/g → mg/kg | $$mg/kg=\text{Conc}[mg/g] \cdot 1000[g/kg]$$ |
| ppm and mg/g | |
| ppm → mg/g | $$mg/g=\text{Conc}[ppm] \cdot 1000$$ |
| mg/g → ppm | $$ppm=\text{Conc}[mg/g] \cdot 1000[g/kg]$$ |
| Operation | Equation |
|---|---|
| ppm and mg/L | |
| ppm → mg/L | $$mg/L=\text{Conc}[ppm]$$ |
| mg/L → ppm | $$ppm=\text{Conc}[mg/L]$$ |
| ppm and mol/L | |
| ppm → mol/L | $$mol/L=\frac{\text{Conc}[ppm]}{MW[g/mol] \cdot 1000[mg/g]}$$ |
| mol/L → ppm | $$ppm=\text{Conc}[mol/L] \cdot MW[g/mol] \cdot 1000[mg/g]$$ |
| mg/L and mol/L | |
| mg/L → mol/L | $$mol/L=\frac{\text{Conc}[mg/L]}{MW[g/mol] \cdot 1000[mg/g]}$$ |
| mol/L → mg/L | $$mg/L=\text{Conc}[mol/L] \cdot MW[g/mol] \cdot 1000[mg/g]$$ |
| Unit | Description |
|---|---|
| % (percent) | This unit represents the concentration of a substance as a percentage, indicating the amount of the substance present in 100 mL of a medium, such as air. |
| ppm (parts per million) | This unit that expresses concentration in parts per million is measured as the weight (denoted in kilogram [Kg]) of a substance found in 1Kg of a medium such as water or soil. |
| ppmV (parts per million by volume) | This unit represents the concentration in parts per million, measured as the volume (in liters [L]) of a substance present in 1 L of a medium, such as air or liquid. |
| mg/m3 (milligram per cubic meter) | This unit expresses the concentration in one cubic meter of air (equivalent to 1L or 1000mL) of a substance in terms of its mass (measured in milligrams). It is used for particulate and gaseous concentrations. |
| mg/L (milligram per liter) | This unit represents the concentration of a substance in one liter of air (1000 mL) based on its mass, measured in milligrams. It is commonly used for assessing concentrations in liquids and gases. |
| mg/kg (milligram per kilogram) | This unit represents the concentration of a substance in one kilogram of soil (1000 g) based on its mass, measured in milligrams. It is generally used for measuring concentrations in solid or semisolid materials such as soil, food, or biological tissues, where the concentration is expressed as the mass of the substance relative to the total mass of the sample. |
| mol/L (mole per liter) | This unit expresses concentrations in terms of the number of substance per volume. A mole is defined as 6.22 x 1023 of a substance per mole. This is commonly used in chemistry as a standard unit for describing chemical solution concentrations. |