Sample Containers, Preservation, and Holding Times

Table of Containers, Preservation, and Holding Times for various Analyses

Analysis Container Size Container Type Preservative Holding Time
Alkalinity, mg/L as CaCO³ 500mL Plastic Ice 14 days
% Solids/Density (Specific Gravity) 500g Plastic Ice 7 days
BOD, 5 day 1L Plastic Ice 48 hours
CBOD, 5 day 1L Plastic Ice 48 hours
COD 250mL Plastic H2SO4 pH<2,
Ice
28 days
Chloride 250mL Plastic Ice 28 days
Chlorophyll-a/Pheophytin Filtration 250mL Amber Ice 48 hours
Coliform, Fecal (Enumeration) 250mL Sterile Sodium Thiosulfate,
Ice
8 hours
Coliform, Total (Presence/Absence) 120mL Sterile Sodium Thiosulfate,
Ice
30 hours
E. coli (Enumeration) 250mL Sterile Sodium Thiosulfate,
Ice
8 hours
Metals 500mL Plastic HNO3 pH<2,
Ice
6 months
Nitrogen, Ammonia 250mL Plastic H2SO4 pH<2,
Ice
28 days
Nitrogen, Nitrate 250mL Plastic Ice 48 hours
Nitrogen, Nitrite 250mL Plastic Ice 48 hours
Nitrate + Nitrite 250mL Plastic H2SO4 pH<2,
Ice
28 days
Oil & Grease 1L Glass (G) H2SO4 pH<2,
Ice
28 days
pH 250mL Plastic Ice 15 minutes
Orthophosphate 250mL Plastic Ice 48 hours
Phosphorus, Total 250mL Plastic H2SO4 pH<2,
Ice
28 days
Solids,
Total Dissolved (TDS)
500mL Plastic Ice 7 days
Solids,
Total Suspended (TSS/MLSS)
1L/250mL Plastic Ice 7 days
Solids,
Volatile Suspended (VSS/MLVSS)
1L/250mL Plastic Ice 7 days
Sulfate 250mL Plastic Ice 28 days

For analyses not listed (such as organics, TCLP, etc.), please contact the ANRA Laboratory Manager at 936-632-7795.

ANRA reserves the right to subcontract samples to other certified laboratories if we are unable to perform the requested analyses. This includes testing for parameters that we do not normally analyze in-house, as well as routine samples if scheduling or workflow dictates.