What is the procedure to test for free dissolved copper?
Testing for free dissolved copper
To test for free (uncomplexed) copper, use the Free Copper Reagent Powder Pillows, 25 mL, pk/100 (Product # 2118669). Free copper is defined as dissolved copper ions that are not complexed to EDTA or other strong complexing agents. Instructions for this modification are listed in copper Method 8506/8026.