Test Procedures
pH
COLORIMETRIC METHOD • CODE 3700-01-SC
QUANTITY
CONTENTS
CODE
60 mL
Chlorphenol Red Indicator
V-2209-H
60 mL
Phenol Red Indicator
V-2304-H
60 mL
Thymol Blue Indicator
V-2213-H
3
Pipets, 0.5 mL, plastic w/caps
0369
*WARNING:
Reagents marked with an * are considered to be potential health hazards. To
view or print a Safety Data Sheet (SDS) for these reagents go to www.lamotte.com.
Search for the four digit reagent code number listed on the reagent label, in the contents
list or in the test procedures. Omit any letter that follows or precedes the four digit code
number. For example, if the code is 4450WT-H, search 4450. To obtain a printed copy,
contact LaMotte by email, phone or fax.
Emergency information for all LaMotte reagents is available from Chem-Tel:
(US, 1-800-255-3924) (International, call collect, 813-248-0585).
The term pH (always written with a lower case p and an upper case H) is correctly defi ned
as the negative logarithm of the hydrogen ion concentration. More simply, the term pH can
be considered to be an index of the amount of hydrogen ion present in a substance, or is a
measure of the acidity of the substance. This index is important as it can be used to quickly
identify the acid, neutral or alkaline (basic) nature of materials. Acidic substances have a
pH less than 7.0, neutral substances have a pH equal to 7.0 and alkaline substances have a
pH greater than 7.0.
Most natural waters have pH values from pH 5.0 to pH 8.5. Acidic, freshly fallen rain water
may have a pH value of pH 5.5 to pH 6.0. When it reacts with soils and minerals containing
weakly alkaline materials, the hydroxyl ion concentration will increase and the hydrogen ion
concentration will decrease. Then the water may become slightly alkaline with a pH of 8.0
to 8.5. Natural sea water has a pH value of 8.1, and changes from this value indicate that
water from an inland source is entering the body of sea water.
Waters more acidic than pH 5.0 and more alkaline than pH 8.5 to 9.0 should be viewed with
suspicion. Mine drainage and acidic industrial wastes are the principal factors in increasing
the acidity of water, and alkaline industrial wastes are the cause of high pH values.
Because pH measurements can be made so simply, and because they can tell so much
about the past and future reactions of water, they are routinely made in water quality
studies. Sudden changes in pH values serve as warning signals that water quality may be
adversely aff ected through the introduction of contaminants.
SMART Spectro 2 Test Procedures 07.05.16
pH
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