By adding PTSA Cas No: 59572-10-0 to the formulation, the fluorescent response of the tracer is proportional and graphically linear, between specific concentration ranges, to the concentration of the chemical with which the system is dosed. Measurement and monitoring PTSA concentration does not require additional chemical reactions, but instead can be directly measured using fluorometry. This method of analysis allows measurements online, in the field and in the laboratory to be expedited quickly and routinely, enabling real time product dose analysis, reduction in detection and reduction of response times. ZXCHEM GROUP