Logo Concept for CDU Lab an Environment Laboratory

This is a logo concept (rejected) for CDU Lab, an environmental laboratory. The logogram interprets the word CDU which represents the name of the company, while the color that I took as the application of the elements handled by CDU Lab itself. In addition, this logo also gives a formal and clean impression and has authority and integrity in it. I use a sans serif font to make an identity for the laboratory.

Please tell me your opinion about this logo!
Thank you