<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31410872</termId><termName>sodium sulfite</termName><termType>PT</termType><termNote><![CDATA[ A soluble sodium salt of sulfurous acid (sulfite), appearing as small crystals or powder. Sodium sulfite is used in multiple industries and exhibits bleaching, reducing, de-sulfurizing, and dechlorinating functions. In the food industry it is used to maintain the appearance of freshness, and to preserve meat. It is also a component in many drugs, to help stabilize and maintain potency. It is used in the pulp and paper industry as a water treatment, and in photography it has been used in developer solutions, and as a hypo clear solution. ]]></termNote><termCreatedDate>2026-03-30 20:50:28</termCreatedDate><relation><relationType>UF</relationType><termId>31410873</termId><termName>sulfite, sodium</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31373712</termId><termName>sulfite</termName><termType>PT</termType></relation></term>  </Zthes>