GB/T 35151-2017Determination of total organic carbon in limestone (English PDF)

3.1 The number of tests and requirements

The number of tests for each test is defined as two and the absolute difference between the two tests is within the limit of repeatability (see Chapter 10)

The average of the results indicates the measurement result.

3.2 Quality and result representation

Mass units with "grams (g)", accurate to 0.0001g.

Unless otherwise stated, the analytical results are expressed in% by mass and the analytical results are expressed in% to two decimal places.

3.3 blank test

The test results obtained were corrected by not adding the test sample, following the same analytical procedure and using the same reagent amount.

4.1 General

Reagents used should be no lower than analytical grade, unless otherwise stated. The reagent used for calibration should be the reference reagent. The water used should not be less than

GB/T 6682 provisions of the three water requirements.

The density of commercially available concentrated liquid reagents listed in this standard refers to the density (rho) of 20 ° C in grams per cubic centimeter (g/cm3).

In chemical analysis, the acid used, who did not note concentration refers to the commercially available concentrated acid.

Reagent dilution is expressed in terms of volume ratio, for example, hydrochloric acid (1 2) indicates that 1 part by volume of concentrated hydrochloric acid is mixed with 2 parts by volume of water.

4.2 Hydrochloric acid (HCl)

1.18g/cm3 ~ 1.19g/cm3, the mass fraction of 36% to 38%.