AUTOMATIC PH ADJUSTMENT DEVICE

摘要

In an embodiment, control is performed to operate a three-way valve in accordance with a reaching ratio of pH adjustment. When process of certain steps is performed, bubbles of ammonia generated in a nebulizer can be extruded by air so as to be injected from an injection port together with aqua ammonia remaining in the nebulizer. Therefore, the pH adjustment can be performed while a large amount of bubbles of ammonia are prevented from being generated in the nebulizer.

主权项

1. An automatic pH adjustment device comprising:
a container that accommodates a liquid sample to which a pH indicator is added, color of the pH indicator changes in accordance with pH; an adjusting liquid bottle that stores aqua ammonia or carbonated water used as a pH adjusting liquid; a nebulizer that is provided with an injection port disposed to face a sample liquid surface in the container and injects from the injection port the pH adjusting liquid stored in the adjusting liquid bottle and atomized by carrier gas; a multi-way valve that is disposed between the nebulizer and the adjusting liquid bottle and performs switching between a liquid injection state in which the nebulizer is allowed to communicate with the adjusting liquid bottle to inject the pH adjusting liquid from the injection port, and an air injection state in which the nebulizer is allowed to communicate with outer air to inject air from the injection port; a detecting device that detects the intensity of light radiated from the outside of the container and transmitted through the container; and a control device that switches the communication state of the multi-way valve on the basis of the intensity of light detected by the detecting device.