 The NELAC Institute

# Audit Sample Calculation Tool Equations

 Sample Volume (dscm): Vm(std) (dscm) = Qm ? Vm(std) = Sample Volume (dscm) Qm = Sampling Rate (dscm/hr); (Default: 1 liter/min or 0.06 m3/hr – Mtd 6 Section 8.3.1) ? = Total Sampling Time (hr) Est In-Stack Gas Concentration (lb/dscf): CSO2 (lb/dscf) = ESO2 (lb/hr)/Qstd (dscf/hr) CSO2 = Estimated In-Stack Gas Concentration for SO2 ESO2 = SO2 Emission Limit (lb/hr) Qstd = Stack Flow Rate (dscf/hr) Est In-Stack Gas Concentration (mg/dscm): CSO2 (mg/dscm) = (CSO2 (lb/dscf)) (35.315 dscf/dscm) (453,592 mg/lb) Est In-Stack Gas Concentration (ug/dscm): CSO2 (ug/dscm) = (CSO2 (mg/dscm)) (1000 ug/mg) Audit Concentration (mg/mL): Ca (mg/mL) = [(CSO2 (mg/dscm)) (Vm(std) (dscm))]/Vsoln (mL) Ca = Audit Concentration Vsoln = Final Diluted Volume per Method (mL); (Mth 6 para 11.2.1 = 100 ml) Audit Concentration (mg/L): Ca (mg/L) = (Ca (mg/mL)) (1000 mL/L) Audit Mass (ug): Ma (ug) = (CSO2 (ug/dscm)) (Vm(std) (dscm)) Ma = Audit Mass Audit Mass (mg): Ma (mg) = (Ma (ug))/(1000 ug/mg) Audit Mass (ng): Ma (ng) = (Ma (ug)) (1000 ng/ug)