PIB 37-153 New CDTA Solution Formulation (ULR Hardness) for Chlorophosphonazo Method

Document ID

Document ID PIB24

Version

Version 6.0

Status

Status Published

Published Date

Published Date 10/03/2018
Title
PIB 37-153 New CDTA Solution Formulation (ULR Hardness) for Chlorophosphonazo Method
Summary
PIB 37-153 New CDTA Solution Formulation (ULR Hardness) for Chlorophosphonazo Method; Hach Lab; Global
PIB Type
Product Change/Update/Other
Customer PIB

-INTRODUCTION:

Due to the updated SDS classifications with current CDTA solution formulation (2589636), the 13% TMAH (tetramethyammonium hydroxide) carries a hazard statement of H310 – Fatal in contact with skin. This updated classification caused concern with many customers; therefore, Hach re-formulated the reagent with a 1:1 dilution to 6.5% TMAH; well below the 10% fatality classification. The current, and soon to be obsolesced CDTA solution (2589636), formulation has never changed since the product was first released; only the hazard statement had been updated to H310.
 
-KEY MESSAGE POINTS:
  • The new formulation, 2589723, is packaged in a 1-oz SCDB bottle
  • In the updated procedure, the operator will use 2 drops per test instead of 1 drop
  • Two drops of the CDTA solution is needed because the formulation has been diluted in half to decrease the TMAH concentration from 13% to 6.5%
  • The new CDTA formulation carries a hazard statement of H311 – Toxic in contact with skin, instead of the fatal in contact with skin (H310)

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