On these operating instructions If the text follows a mark (as shown on the left), this means that an important instruction follows. Italic indicated text indicates that the text concerned appears in writing on the display(or must be typed). If the text follows a mark (as shown on the left), this means that an important warning follows relating to danger to the user or damage to the apparatus.The user is always responsible for its own personal protection. The carbonate content of the soil is a sure indication of the fertility of the soil. To be able to determine the carbonate content of the soil...

Information The device (see drawing) • On top of the device twoway cocks (4) have been mounted. These work as follows: - By turning the handle in an upward position the reaction vessel (3) as well as the burette (5) are de-aerated; this is the deaeration position. - By placing the handle in a horizontal position the de-aeration is closed and the reaction vessel is connected with the burette; this is the measuring position as well as the testing position. • The buffer vessels (1) can be moved up- and downward by holding the buffer holder and pressing the black button (2) with the thumb. The blocking...

Part of the laboratory sample (appr. 2.5 g) is treated on a watch glass with approx. 1 ml hydrochloric acid. The carbonate content is estimated based on the time the bubbling lasts. Based on these estimates the quantity of the sample for the analysis is determined. See NEN-ISO 10693 page 4, paragraph 7.1. Fill a reaction vessel with a little calcium carbonate (CaCO3). Place the test tube with hydrochloric acid in the reaction vessel using a pair of tweezers (prepare a reaction vessel for each burette). Close the reaction vessel using the stopper. Place the cock in the measuring position and by...

raise the level in the buffer vessel. Do not allow this difference in level to exceed 3 ml. If the difference were to exceed 3 ml, the CO2 would come under pressure, which would increase its solubility in water. This will yield a less accurate result. Shake the reaction vessel every now and again to allow the reaction to proceed to as near completion as possible. Shake for 5 minutes. When the volume no longer varies, note this volume. If the volume continues to increase, shake until the volume becomes stable (do not shake for longer than 1 hour). Before calibration weigh 0.2 and 0.4 g (dried)...

Shake for 5 minutes. When the volume no longer varies, note this volume. If the volume continues to increase, shake until the volume becomes stable (do not shake for longer than 1 hour). For soil containing carbonates that are harder to dissolve, such as shells, this may take somewhat longer. It is generally accepted that the reaction is complete when no further bubbling can be observed. Bring the burette and the buffer vessel to the same level and read the volume. If this has been done for all five reaction vessels, the measurement is complete.  The change in volume during the determination...

The difference between two singular measuring results, obtained under repeatable circumstances should not exceed the values indicated in table 2 of NEN-ISO 10693, page 5, paragraph 9. Carbonate content g/kg 0 till 50 > 50 till 150 > 150 till 180 > 180 Acceptable differences 3 g/kg 6% of the value 9 g/kg 5% of the value More information on sample preparation, calculations and repeatability can be found in the standard ISO 10693. Nothing in this publication may be reproduced and/or made public by means of print, photocopy, microfilm or any other means without previous written permission from Royal...