What documentation is available to support the use of the DPD Chlorine methods for reporting?

Document ID

Document ID TE10262

Published Date

Published Date 05/16/2022
Question
What documentation is available to support the use of the DPD Chlorine methods for reporting?
Summary
Links to documentation needed to show that these methods (High Range (HR), Mid Range (MR), and Low Range (LR)) are USEPA Accepted for Compliance reporting when using Hach instrumentation.
Answer
To show that using a Hach instrument and methods for Chlorine testing is USEPA Accepted a regulator may require multiple pieces of documentation. The documentation required is often documentation that shows what Hach method is used when using a specific instrument, and an acceptance letter from the USEPA for that method.

Low Range (LR) DPD - The standard Hach Method Chlorine, Free, Method 8021 DPD Method, Powder Pillows or AccuVac® Ampuls_DOC316.53.01023 and Chlorine, Total, DPD Method 8167, AVPP_DOC316.53.01027 documents are formatted specific to currently available Spectrophotometers (DR1900, DR3900, and DR6000) and Multi-Parameter Colorimeter (DR900). Single-parameter Colorimeters (Pocket Colorimeter II and DR300) have one document that is combined Chlorine, Free and Total, Low Range, DPD Method 8021 (free)/8167 (total), AccuVac Ampuls, DR300 and Pocket Colorimeter II_DOC316.53.01450 as stated in the top right hand corner of page 1, and is formatted to be specific to these instruments. These are the methods that are included in the O'Dell 1996 letter. 

Mid-Range (MR) DPD- The Standard Hach Methods Chlorine, Free-USEPA DPD Method 10245 MR, Powder Pillows_DOC316.53.01303 and Chlorine, Total, MR, DPD Method 10250 PP_DOC316.53.01304 are formatted specific to currently available Spectrophotometers (DR1900, DR3900, and DR6000) and Multi-Parameter Colorimeter (DR900). Single-parameter Colorimeters (Pocket Colorimeter II and DR300) have a separate document that are combined Chlorine, Free and Total, High Range, DPD Method 10069 (free)/10070 (total), Powder Pillows, DR300 and Pocket Colorimeter II_DOC316.53.01490.

High Range (HR) DPD- The Standard Hach Methods Chlorine, Free, Method 10069 DPD, Powder Pillows_DOC316.53.01025 and Chlorine, Total, HR, DPD Method 10070 PP_DOC316.53.01029 are formatted specific to currently available Spectrophotometers (DR1900, DR3900, and DR6000) and Multi-Parameter Colorimeter (DR900). Single-parameter Colorimeters (Pocket Colorimeter II and DR300) have two separate documents that are combined Hach Methods 10069 and 10070. First is the one that is used by the single-parameter colorimeters that do both LR and HR. This HR method uses the same reagent pillows as the LR method: Chlorine, Free and Total, High Range, DPD Method, Powder Pillows, DR300 and Pocket Colorimeter II_DOC316.53.01449. The other is the one that is used by the single-parameter colorimeters that do both MR and HR, as well as the ones that do both HR Chlorine and pH. This method uses a different reagent then the LR method and matches the one used in the standard Hach methods for HR: Chlorine, Free and Total, High Range, DPD Method 10069 (free)/10070 (total), Powder Pillows, DR300 and Pocket Colorimeter II_DOC316.53.01490

The HR and MR Methods actually follow methods 8021 and 8067 in terms of chemistry but have had the ranges extended. As stated in the Telliard letter, these range extensions do not require a separate approval, so these methods are also USEPA Accepted. 

Chlorine, Free and Total, Mid-Range, DPD Method 10245 (free)/10250 (total), Powder Pillows, DR300 and Pocket Colorimeter II_DOC316.53.01451
DOC326.98.00002 Hardness (Total) Test Kit Manual, Model HA-71A, Drop Count Titration Kit 1452-01
Surfactants, Anionic (Detergents)-Crystal Violet Method 8028_DOC316.53.01138

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