I got 2 new boxes of reagent this evening and it was perfect timing as I had one pack left from my older box of reagents (took almost 2 weeks to get shipment as carrier sent it to 2 different states, doh!).
Within the last 45 min, I used 4 packs, one of reagents from last box and got 4 different numbers? The last 3 were from Lot 0081 and first pack turned my water blue and made the Hanna checker blink at 200.
2nd reagent read 42 (or .129ppm).
3rd reagent read 11 (.034ppm).
batteries were swapped about 3mo ago and all readings from prior reagent boxes seemed normal or within reason.
I clean each vile after every use and put a piece of napkin inside to absorb any leftover DI.
I use a digital pipette for consistent ml per test (any test kit needing specific ml), I wipe down every vile and insert with the 10ml printing on vile facing me and mix everything with a magnetic stirrer.
At what point is this lot considered bad?
Asking for opinions before I complain.
Within the last 45 min, I used 4 packs, one of reagents from last box and got 4 different numbers? The last 3 were from Lot 0081 and first pack turned my water blue and made the Hanna checker blink at 200.
2nd reagent read 42 (or .129ppm).
3rd reagent read 11 (.034ppm).
batteries were swapped about 3mo ago and all readings from prior reagent boxes seemed normal or within reason.
I clean each vile after every use and put a piece of napkin inside to absorb any leftover DI.
I use a digital pipette for consistent ml per test (any test kit needing specific ml), I wipe down every vile and insert with the 10ml printing on vile facing me and mix everything with a magnetic stirrer.
At what point is this lot considered bad?
Asking for opinions before I complain.