Maintaining high water quality is essential across various sectors, from environmental conservation to industrial processes. Central to this effort is the accurate measurement of key parameters, with pH and alkalinity being particularly important. For these analytical tasks, Cresol Purple (CAS 2303-01-7) stands out as a reliable and widely used indicator. Its distinctive properties make it a cornerstone reagent for laboratories performing water analysis.

Cresol Purple, a triphenylmethane dye, is recognized for its dual-range pH indication capabilities. Presenting as a purple to dark purple crystalline powder, its chemical formula is C21H18O5S. The indicator's utility in water quality monitoring is primarily its accuracy in detecting the alkalinity of water. This involves observing its color transition from yellow to purple within the alkaline pH range of 7.6 to 9.2, providing a clear visual benchmark for assessing water composition.

Beyond alkalinity, Cresol Purple also serves as a valuable indicator in the acidic range, shifting from red to yellow between pH 1.2 and 2.8. This broad spectrum of color change allows it to be useful in a variety of analytical procedures. For research scientists and product formulators, this versatility means a single reagent can often suffice for multiple testing requirements, streamlining laboratory operations.

When considering the purchase of Cresol Purple, procurement managers often prioritize suppliers who can guarantee high purity (≥98%) and consistent lot-to-lot quality. This ensures that analytical results are reproducible and reliable. Establishing a relationship with a trusted manufacturer or supplier, particularly one that can offer competitive pricing and bulk options, is crucial for continuous monitoring programs and research projects.

For any laboratory focused on water quality analysis, understanding the role and sourcing of Cresol Purple is a key aspect of efficient operation. Whether you are performing routine environmental testing or in-depth research, securing a dependable supply of this critical pH indicator is paramount. If you need to buy Cresol Purple and are seeking a quality supplier, consulting with experienced chemical manufacturers will provide the necessary insights and product assurance.