I recently bought the Hach TNTplus 816 COD vials for salt/seawater and tried to test is with another lab's spec but realized their spec doesn't have this test's program stored. I plan to buy the corresponding spec but before that I really need to calculate COD for the samples I tried to measure. I have the absorbance values and I'm looking for the standard curve. If anyone out here has a standard curve for the TNTplus 816 COD HR (70-1000 mg/L) test that they would be willing to share with me, that would be greatly appreciated! Thank you so much!