petrosense - an Independent study
Fiber Optical Sensor (FOCSTM) System – used to directly and quickly monitor concentration of total petroleum hydrocarbons in the air, at the air/water interface, and dissolved in water. FCI's hydrocarbon sensor is designed to monitor the concentration of dissolved BTEX in water, liquid product at the air/water interface , and BTEX in vapor.
PetroSense sensors are very sensitive to BTEX and its individual components dissolved in water. The Sensors are capable of detecting low concentrations of BTEX with a high degree of accuracy. FCI’s sensors match readings taken via the gas chromatograph with at least a 98% correlation." Based on a comparison with EPA Method 8020.
The PetroSense sensors begin to respond immediately to the presence of BTEX hydrocarbons dissolved in water. They provide quantitative results in ppm of the compound used to calibrate the system. When measuring blind samples of p-xylene the probes correlate with the GC at the 99% level. The blind samples run with benzene (RRF of 6.233) showed a quantitative correlationof 97% with the GC and UV. Toluene (RRF of 2.857) gave similar results with a correlation of 98%. Ethyl benzene (RRF of 1.034) had a correlation of 98%. And when run with a 1:1:1:1 mixture of BTEX the average RRF is 1.730 and the correlation was 98%.
And Quick In the presence of product, the sensors achieve a 95% detection level in approximately 5 minutes. When the sensors are removed from contaminated water containing a product and placed in chemical-free water, the fall back time to a baseline reading occurs in approximately 2 minutes.
Wilcox Evalutions and Reports of the PetroSense Fiber Optical Sensors