One half ml of mixed reagent is added to samples and standards and mixed thoroughly. Color is developed for 60 minutes and absorbance is read at 880 nm against a DDW reference. Standards are corrected for absorbance of reagent blanks and samples are corrected for absorbance of filter or procedural blanks. Data Reduction and Calculations 6.1. Store in plastic bottle in the dark.
Solution is stable indefinitely.
Solution is stable for many months. Store in a dark bottle with 1 ml of chloroform. Dilute 10 ml of the stock standard to 100 ml, using a volumetric flask. Dilute the working standard to prepare a series of standards to cover the range from 0.05 - 10 uM. 9. A Practical Handbook of Seawater Analysis.