Справочник Пользователя для Hanna Instruments c 214
19
HEALTH & SAFETY
The chemicals contained in the reagent kits may be
hazardous if improperly handled. Read the Health & Safety
Data Sheet before performing tests.
hazardous if improperly handled. Read the Health & Safety
Data Sheet before performing tests.
Safety equipment: Wear suitable eye protection and clothing when
required, and follow instructions carefully.
Reagent spills: If reagent spillage occurs, wipe up immediately and rinse
with plenty of water.
If reagent contacts skin, rinse the affected area thoroughly with water.
Avoid breathing released vapors.
Reagent vial disposal: Reagents vials may contain different waste
pollutants. After use dispose of the reagent vials according to the local
regulations.
required, and follow instructions carefully.
Reagent spills: If reagent spillage occurs, wipe up immediately and rinse
with plenty of water.
If reagent contacts skin, rinse the affected area thoroughly with water.
Avoid breathing released vapors.
Reagent vial disposal: Reagents vials may contain different waste
pollutants. After use dispose of the reagent vials according to the local
regulations.
62
• The instrument directly displays concentration in
mg/L of
phosphate (PO
4
3-
) on the Liquid Crystal Display.
The method detects free (orthophosphate) and condensed inorganic
forms (meta-, pyro- and other polyphosphates) of phosphates
present in the sample.
forms (meta-, pyro- and other polyphosphates) of phosphates
present in the sample.
• To convert the reading to mg/L of P
2
O
5
, multiply by a factor of
0.748.
• To convert the reading to mg/L of phosphorus (P) concentration,
multiply by a factor of 0.326.
Note: for accurate measurements
1) wash glassware only with phosphate-free detergents
2) clean all glassware with 1 : 1 hydrochloric acid solution and rinse with
deionized water.
1) wash glassware only with phosphate-free detergents
2) clean all glassware with 1 : 1 hydrochloric acid solution and rinse with
deionized water.
INTERFERENCES
Interference may be caused by:
Arsenate: at any level
Silica:
Arsenate: at any level
Silica:
above 50 mg/L
Sulfide:
above 9 mg/L.
To eliminate sulfide: add Bromine Water drop-wise until a
pale yellow color develops; remove Bromine Water excess
by adding Phenol solution drop-wise.
To eliminate sulfide: add Bromine Water drop-wise until a
pale yellow color develops; remove Bromine Water excess
by adding Phenol solution drop-wise.
Turbidity: turbidity and suspended matter in large amounts may
cause interference because the strongly acidic reaction
conditions may dissolve suspended matter or cause
desorption of phosphates from particles. Before
measurement, turbidity or suspended matter should be
removed by treatment with active carbon and by prior
filtration.
conditions may dissolve suspended matter or cause
desorption of phosphates from particles. Before
measurement, turbidity or suspended matter should be
removed by treatment with active carbon and by prior
filtration.
Phosphorus, Acid Hydrolyzable