PH pen calibration Note: 

PH pH 4.01， 6.86 standard solution prepared powder has two specifications， 

Each package can be formulated 250ML standard solution. (Generally calibrated using calibration powder 6.86) 

Note: 

(PH pen have been calibrated prior to shipment buyer received the goods do not need to re-calibrate! So as to avoid errors caused by PH pen calibration error becomes large!) 

In the following cases， PH meter must be recalibrated: 

After calibration has been used (or place) for a long time; 

Frequent use of special electrodes; 

Accuracy requirements are relatively high. 

Usage: 

Cut the plastic bag， pour the powder 250ML flask， distilled water with a small amount of non-CO2 plastic wall， and dilute to the mark and shake can. 

Powder shelf life of 2 years. 

Under the premise of not pollute the calibration solution can be reused. After watered shelf life of six months or so. 

Calibration calibration solution becomes pink against a good following steps after operation ↓ 

Calibration solution used methods: 

The pH meter electrode with pure washed clean (2-3 times) 

1， the pH electrode under 6.86 (25 ℃ immersed in pH value， standard mixed phosphate buffer solution， and gently shake. 

2， with a small screwdriver to adjust the calibration potentiometer until the display value and the standard buffer solution at ambient temperature， ph value of the match.

3， the electrode is inserted phosphorus potassium pH4.00 stupid acid or borax pH9.18 standard buffer solution. 

4， after about two minutes or so. PH value of the buffer value is displayed to be compared within the allowable error range. 

The so-called two-point calibration， calibration calibration solution is to use two sizes of three-point calibration is the calibration solution calibration in three sizes. 

Generally start with 6.86 to start the calibration. Then with 4.00 or 9.18. 

Alkaline water， there is no national standard， only the industry standard. 

PH value of 7 is neutral， acidic below 7， greater than 7 is less than 8.5 is alkaline， above 9.5 is strongly alkaline. 

Drinking alkaline water recommended value of about 7.5-8.5， higher than the 8.5 alkaline water should be consumed under the guidance of a doctor. 

Three steps: 

1 Remove the protective cover. 

2， washing with distilled water and pH meter electrodes. Dry with filter paper and the electrode. 

3， turn the switch located on the battery compartment. 

4， inserted into the fluid to be measured pH meter until the liquid immersed "immersion line" conditions allow， the solution can slightly dipped "immersion line" position. 

5， gently stirring the solution and wait about two minutes Chung. Read the display. 

6， after use. Cleaning electrodes. Turn off the switch. Wear a protective sleeve. 

Meter was calibrated: the pH standard solid material. Can be used to open the package after adding water. Applicable to any type pH meter calibration. Two kinds of specifications for pH = 4.00; 6.86 and is valid for five years. 

New: ① ★ backlit， large-size LED screen ★ 

      ② ★ resolution of up to 0.01， the error is ± 0.01 ★ 

      ③ ★ built-in temperature compensation ATC Oh! Error is smaller ★ 

≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ 

② the old PH pen

① ★ ★ small screen without backlight 

② ★ accuracy of 0.1， the error is ± 0.1 ★ 

③ ★ ★ no temperature compensation function

[Hazards and control measure an important indicator of water quality in aquaculture water PH] 

■ change of Ph 

→ Help PH value increased more than the water phytoplankton photosynthesis， high concentrations of dissolved oxygen 

PH value decreased → deterioration in water quality， dissolved oxygen reduction performance. 

Photosynthetic organisms in water， respiration， and various chemical changes can cause changes in PH value， and the impact of its changes Yuxia and water quality are great. Impacts on water quality: PH value ≤ 6， in the form of hydrogen sulfide sulfide as long as the existence of increased toxicity sulfide， water prone to hypoxia phenomenon; PH value ≥ 8， a large number of NH4 + will be converted into toxic NH3 . 

 

■ PH is too high or too low can cause poisoning symptoms 

Alkalosis symptoms: 

Fish: irritation and amusement mad scurry; surface a lot of mucus or even drawn into wire; gill cover corrosion damage， there are a lot of secretions gills condensation; PH> 9， the water will be there are many dead and dying algae the algal cells. 

Shrimp: shrimp gill tissue destruction occurs black gill disease， which in turn evolved into gill rot， yellow and red gill disease of the respiratory function of gill disease → ​​happened obstacles suffocation. 

Acidosis symptoms: 

Fish: clear white body color; aquatic plants showed brown or white; water transparency increased significantly; waters there are many dead and dying algae algal cells. 

Note: In addition， if the fish quickly transferred from one body of water to the PH value of water varies greatly， even within the PH value of the second body of water in the tolerance range of the species， it may lead to shock and death of fish. 

■ PH value control standards 

"Fishery Water Quality Standards" provides: Mariculture PH value is generally controlled between 7.0-8.5， freshwater aquaculture PH value should be maintained between 6.5-8.5. Actual aquaculture， PH value between 6.5-9.0 control， not more than 9.2; mariculture between 7.5-8.5， the difference shall not exceed 0.5 per day. PH value at less than 4 or higher than 10.6， Yuxia can not survive. 

■ control measures PH value 

Prevention: frequently detect changes in water PH value， preferably once a day， morning and evening， once the exception is necessary to promptly identify the causes and take effective measures to deal with. 

Control measures: 1) If the water acidic (PH <6.5) can be added to lime， sodium hydroxide and other alkaline water regulator to adjust; appropriate amount of water changes; "fertilizer special number" or "fat water conservancy antibiotic" with the "effects of fertilizer cream "to use， rapid proliferation of phytoplankton. 2) If the water is slightly alkaline (PH> 9.5)， the entire pool to cast the "green power source"， can increase the amount of use， re-use "bottom reform King"， "diversion probiotics"， "bacteria power of God" or "EM bacteria "for water quality improvement; Flow body floating plants too， then use the" green power source "or" diversion probiotic "Control Aqua too thick. Conditions may be changing some of the water， new water. 

PH value of various reference: 

Toner is the only thing worth buying pH value of 5.5 ~ 

Medicated Sekkisei 5.5 

KIEHLS cucumber water 5.5 

Boots water balance 5.5 

Boots Toner 5.5 

LUMENE alcohol-free lotion (white bottle) 5.5-6 

Avon Energizing lotion 5.5-6 

NIVEA powder in water 6.5 

Shiseido Pureness Balance Toner 6.5 

KOSE Capture the essence of time， PH = 8 

Alkaline water Clinique 2> = soap 

U.S. Department of homes orange blossom water， weak acid 

Nnskin PH Oil Control Lotion 5.5 

Nnskin PH Gentle Toner 5.5 

KOSE Five subacidity 

Oubo Lai firming slightly acidic water 

Pill U.S. polyphenols shrink slightly acidic water 

High 丝葛伦黛娜 lotion subacidity 

Elene Collagen Firming slightly acidic water 

Elene grease convergence Toner subacidity 

L'Oreal Whitening Lotion 5.5 

SOFINA RISE Toner subacidity 

IPSA metabolizer subacidity 

Juvena weak acid powder in water 

Dr. Li magic acne weakly acidic water 

Lanceome Blanc Expert XW acidic 

U.S. Department of homes Chamomile flower water acidity 

Cleanser: 

CM Soap: neutral to weak base 7 to 7.5 

MARYKEY neutral cleanser No. 2: Comparison of partial weak acid， about 6 to 6.5 

H2O Marine Clean mile: neutral to weak acid， June 5-7. 

H2O Marine cleanser: weak acid， about 6 to 6.5 

The Cleansing Gel 7.2 AVENE 

AVENE Gentle Cleanser 5.5 

Soap is also 5.5 AVENE 

Softto papaya white skin cleanser (freckle recipe): weak acid， 6 to 6.5 

6.5 cable skin cleanser face-lift 

Special fiber cable skin moisturizing face cream 7.0 

Algae Cleansing mud beside the Cape more than eight 

Nnskin Refreshing Cleansing Gel 5.5 

Nnskin Cleansing 5.5 Pa 

Shiseido naturgo natural mud wash ph value of 9 

EA of 2-IN-1， 6 

Lancome's clean Cleansing honey， about 7 

Lancome Refreshing Cleansing Foam，> 7 

Lancome Whitening Foam Cleanser 6.9 

Kanebo Cleanser Peach PH7.5 

White Cleansing Cream PH 7.1 kose 

Clinique soap is an alkali， there are more than 9 

Nivea Whitening Foam Cleanser PH7.3 

NIVEA feminine cleansing Pycnogenol 6.5 

Biore Facial Foam Cool 6.4 

Biore fat soluble oil to 7.5-8 

Biore Deep Cleansing weak acid 6-6.5 

Shop lavender fragrance Cleansing Gel 7-7.2 

Aloe Cleanser