Hold Times

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Analysis	Container	Preservative	Holding Time (Days unless stated otherwise)
pH	250 ml Plastic	NONE	15 minutes
Alkalinity	250 ml Plastic	NONE	14
Ammonia, Nitrogen	250 ml Plastic	0.5 ml H2SO4	28
Acute Bioassays	cubitainers	NONE	36 hours
Chronic Bioassays	cubitainers	NONE	36 hours
5-Day BOD	500 ml Plastic	NONE	48 hours
Chloride	500 ml Plastic	NONE	28
Chlorophyll A	2 liter amber glass	NONE	48 hours
Color ADMI	250 ml Plastic	NONE	48 hours
COD	250 ml Plastic	0.5 ml H2SO4	28
Conductivity	250 ml Plastic	NONE	14
Cyanide, Total	250 ml Plastic	2 pellets NaOH	14
Fecal Coliform	250 ml Plastic	0.4 ml 10% Na2SO3O3	8 hours
Flashpoint	100 ml Any	NONE
Fluoride	500 ml Plastic	NONE	28
Hardness	500 ml Plastic	1 ml HNO3	6 months
Ignitability	20g ANY	NONE
MBAS	500 ml Plastic	NONE	48 hours
Metals	500 ml Plastic	1 ml HNO3	6 months
Mercury	500 ml Plastic	1 ml HNO3	28
Nitrate/Nitrite	250 ml Plastic	0.5 ml H2SO4	28
Nitrate and/or Nitrite	250 ml Plastic	NONE	48 hours
Oil & Grease	1 liter wide-mouth glass	5 ml 1:1 HCI	28
Orthophosphate	250 ml Plastic	NONE	48 hours
Phenols	1 liter glass	1 ml H2SO4	28
Salinity	250 ml Plastic	NONE	28
Settleable Solids	1 liter Plastic	NONE	48 hours
Sulfate	500 ml Plastic	NONE	28
Sulfide	1 liter Glass	3 pellets NaOH + 1 ml 2M Zinc acetate	7
TOC	250 ml Amber Glass	1 ml H2PO4	28
Total Dissolved Solids	500 ml Plastic	NONE	7
Total Kjeldahl Nitrogen	250 ml Plastic	0.5 ml H2SO4	28
Total Phosphorous	500 ml Plastic	1 ml H2SO4	28
Total Residual Chlorine	250 ml Plastic	NONE	15 minutes
Total Solids	250 ml Plastic	NONE	7
Total Suspended Solids	1 liter Plastic	NONE	7
Turbidity	500 ml Plastic	NONE	48 hours
Volatile Solids	500 ml Plastic	NONE	7