Total Alkalinity Test Kit

1. Specification

Name: Total alkalinity Test Kit

Model: LH-2018

Type: quantitative

Measuring range:10-200mg/L(calculated as CaCO₃)

Packaging: 50tests/box

Method: Acid base titration Method

Shelf life: at least 1year

2. Feature

Convenient to use:

Operating in accordance with the instructions, users can complete the alkalinity test independently without specialized training. Five minutes is enough to complete the analysis of one water sample. Light weight and small size, suitable for detection on site, and minimize the errors caused by long transportation; Standardized operation, and minimized manual errors; Real-time monitoring of ozone concentration in production process.

Accurate Measuring:

Scientific formulation, special techniques, and strict quality control; Research and development conducted under international standards and methods; Produced from imported materials, including color agent, buffer agent, spiking agent, and covering agent, etc; Standardized precise colorimetric cards specialized for colorimetric tubes; Double layers aluminum foil, preventing moisture and light.

This method equals to the standard method that is acid-base indicator titration method (“water and wastewater monitoring and analysis methods”(4th edition)). The water sample is titrated with standard acid solution to the required pH. The titration end point can be judged by acid-base indicator with changing of its color in this pH value.

3. Operation

1. use the transferpettor measure 15mL testing liquid to erlenmeyer flask.

2. add 3 drops reagent I, sway the flask, the liquid will become to red, if not please go to step 4.

3. add reagent II with 3drops/s while swaying the flask till liquid become transparent, record the volumeV1,

4. add 3 drops reagent II, the liquid now is green.

5. add reagent III till the liquid become deep red from green, record the volumeV2.

6. phenothalin alkalinity=V1*10(mg/L), total alkalinity=(V1+V2)*10(mg/L).

Notes:

1. wash the erlenmeyer flask with deioniazed water before testing.

2. had better get rid of the first drop of the reagent to insure the accuracy.

4. Background of development

Sources of alkalinity:

The water alkalinity refers to the amount of substances containing in water which could receive hydrogen ions. There are a variety of sources such as hydroxide, carbonate, bicarbonate, phosphate, silicate, sulfite and nitrogen, etc., which are common alkaline substances exist in water and can react with the acid.

The significance of alkalinity test
Alkalinity is a kind of comprehensive characteristic index of water, which represents the total amount of substances that can be titrated by strong acid. Alkalinity index commonly used in the evaluation of the buffering capacity of water and in which the solubility and toxicity of metal. It is an indicator to judge the controlling in process of water and wastewater treatment. If the alkalinity is formed of an excessive amount of alkali metal salts, then the alkalinity is also an important basis for determining whether the water is suitable for irrigation.