Dear Ms.Sirintip,
I appreciate your inquiry.
Glass bottles are damaged by alkaline solution,
because Si-O-Si bond of glass is breaked by OH.
Glass is stable toward neutral and acid solution.
So, alkaline tartrate solution, 0.55 M sodium carbonate,
alkaline copper test solution, and 0.5 mol/L sodium hydroxide test solution
are recommended to be stocked in plastic bottles.
But never mind !
I do not think it will affect on assay so much.
Dibasic sodium arsenate test solution --- Yes, you are absolutely right.
I am sorry for the error.
It is the solution for arsenic molybdenum test solution.
If you have any other questions,
please feel free to contact me.