Samples sent to HU Water Chemistry Laboratory should be in sufficient volume and be properly preserved. Please refer to following table (taken from Standard Methods) for details. Samples must reach the laboratory well before the maximum storage duration expires.

Parameter	Minimum Sample Size(ml)	Type of Sample Container	Preservation Method	Maximum Storage Duration	Standard Method Number
Acidity	100	P,C	Keep cool at 4°C	24 hour	402
Alkalinity	100	P,C	Keep cool at 4°C	24 hour	403
Arsenic	100	P,C	HNO3 to pH<2	6 month	404
BOD	1000	P,C	Keep cool at 4°C	6 hour	507
Bromide	100	P,C	Keep cool at 4°C	24 hour	406
COD	50	P,C	H2SO4 to pH<2	7 day	508
Chloride	50	P,C	None required	7 day	408
Chlorine (Residual)	50	P,C	Keep cool at 4°C	24 hour	412
Color	50	P,C	Keep cool at 4°C	24 hour	204
Cyanide	500	P,C	Keep cool at 4°C NaOH to pH 12	24 hour	413
Dissolved Oxygen					402
Probe	300	C	In-situ measurement	none
Winkler titration	300	C	In-situ measurement	none
Fluoride	300	P,C	Keep cool at 4°C	7 day	414
Hardness	100	P,C	Keep cool at 4°C	7 day	309
Iodine	100	P,C	Keep cool at 4°C	24 hour	416
MBAS	250	P,C	Keep cool at 4°C	24 hour	512
Metals
Dissolved	200	P,C	Filter in-situ, Add HNO3 to pH<2	6 month
Total Suspended	100		Filter in-situ, Add HNO3 to pH<2	6 month
Mercury					315
Dissolved	100	P,C	Filter in-situ, Add HNO3 to pH<2	38 day (glass)
				13 day (hard plastic)
Total	100	P,C	Add HNO3 to pH<2	38 day (glass)
				13 day (hard plastic)
Nitrogen					417
Ammonia	400	P,C	Keep cool at 4°C H2SO4 to pH<2	24 hour	418
Kjeldahl	500	P,C	Keep cool at 4°C H2SO4 to pH<2	24 hour	421
Nitrate	100	P,C	Keep cool at 4°C H2SO4 to pH<2	24 hour	419
Nitrite	50	P,C	Keep cool at 4°C H2SO4 to pH<2	24 hour	420
NTA	50	P,C	Keep cool at 4°C	24 hour	-
Oil and grease	1000	C	Keep cool at 4°C H2SO4 to pH<2	24 hour	502
Organic Carbon	25	P,C	Keep cool at 4°C H2SO4 to pH<2	24 hour	506
pH	25	P,C	Keep cool at 4°C Yerinde belirlenir	6 hour	424
Phenol	500	C	Keep cool at 4°C H3PO4 to pH<4 1.0 g CuSO4/1-	24 hour	574
Phosphorus
Ortho-phosphate	50	P,C	Filter in-situ,Keep cool at 4°C	24 hour	425
dissolved
Hydrolized	50	P,C	Keep cool at 4°C H2SO4 to pH<2	24 hour
Total	50	P,C	Keep cool at 4°C	24 hour
Total dissolved	50	P,C	Filter in-situ,Keep cool at 4°C	24 hour
Residue					208
Filtrable	100	P,C	Keep cool at 4°C	7 day
Nonfiltrable	100	P,C	Keep cool at 4°C	7 day
Total	100	P,C	Keep cool at 4°C	7 day
Volatile	100	P,C	Keep cool at 4°C	7 day
Settleable Matter	1000	P,C	None required	24 hour	208
Selenium	50	P,C	Add H3PO4 to pH<4	6 month	318
Silica	50	P	Keep cool at 4°C	7 day	426
Specific Conductivity	100	P,C	Keep cool at 4°C	24 hour	205
Sülfate	50	P,C	Keep cool at 4°C	7 day	427
Sulfide	50	P,C	Add 2 ml zinc asetate	24 hour	428
Sulfite	50	P,C	Keep cool at 4°C	24 hour	429
Temperature	1000	P,C	In-situ measurement	none	212
Odor	200	C	Keep cool at 4°C	24 hour	206
Turbidity	100	P,C	Keep cool at 4°C	7 day	214

P: Plastic(polyethylen or equivalent) sample container C: Glass sample container