Quality Control and Proficiency Samples
16
–
30
of
202
results
27
SPEX CERTIPREP LLC 3P Hardness STND 2/PK
NSI Lab Solutions PEI-145 Hardness Drinking Water Proficiency Test; 2/PK
28
SPEX CERTIPREP LLC 3P Orthophosphate P QC Conc 21mL
NSI Lab Solutions QCI-141 Orthophosphate-P QC Concentrate Certified Reference Material, 21 mL; 1/EA
29
Hach Company Quaternary Ammonium Compound (QAC) Standard Solution, 100 mg/L, 100 mL
For accuracy checks in Quaternary Ammonium Compound (QAC) determinations. 100 mg/L as CTAB.
30
SPEX CERTIPREP LLC 3P GGA CONCENTRATE
(NSI by Zeptometrix) GGa Concentrate Snips for BOD5. a box of 25 single-use snips, each containing 6 mL of Glucose: Glutamic acid solution (300 mg/L total). Just snip open the tube and pour contents directly into a 300 mL BOD bottle. Yields a 2% solution of GGa as per SM 5210B. We've sterilized the solution in the snip, it is sterile indefinitely at room temperature until opened.