<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343424</termId><termName>calcium bicarbonate</termName><termType>PT</termType><termNote><![CDATA[ An aqueous solution of calcium carbonate dissolved in carbonic acid. Calcium bicarbonate has been used as a neutralization and alkalization agent in paper conservation. Chemical formula: Ca(HCO3)2. ]]></termNote><termCreatedDate>2026-03-30 20:32:37</termCreatedDate><relation><relationType>UF</relationType><termId>31343425</termId><termName>calcium hydrogen carbonate</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343426</termId><termName>carbonate, calcium hydrogen</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31319736</termId><termName>compounds</termName><termType>PT</termType></relation></term>  </Zthes>