現在是 2025-08-25 0234 AM, 看到 IARC 第一類致癌物的清單，這不是用來測餘氯的試劑
95-53-4 ortho-Toluidine (4-甲基苯胺 )
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用來測水中餘氯的：
o-tolidine (鄰-二甲基聯苯胺 (PubChem o-Tolidine | C14H16N2 | CID 8413)
想到多年前這篇草稿。現在整理好刊出
2018-12 開始編輯，現在 2019-03-06 先公開，持續編輯中
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看到某篇網路文章，說測定的事際會致癌，阿原當時正在準備學生實驗，所以不確定這樣的訊息，目前找資料的結論：IARC 列為第一類 (不只動物，對人體有證據證明會致癌)
en wiki
Tolidine 2-Tolidine (orthotolidine, o-tolidine; not to be confused with o-toluidine) is an organic compound with the chemical formula (C6H4(CH3)NH2)2.
Several isomers are known; the 3-tolidine derivative is also important
commercially. It is a colorless compound although commercial samples are
often colored. It is slightly soluble in water. It forms salts with acids, such as the hydrochloride, which is commercially available.
(英文維基百科說明可能致癌。這可以參考，因為維基百科目前不被認為有效的資料機構，但值得參考)
科學月刊 2017-01-03
破解水中餘氯的迷思 高憲明
https://bioant.blogspot.com/2008/12/oto.html
http://dons.osha.gov.tw/1106/1113/1115/3178/
修正「特定化學物質危害預防標準」部分條文。
附修正「特定化學物質危害預防標準」部分條文
附表一公告毒性化學物質及其管制濃度與大量運作基準一覽表
https://oaout.epa.gov.tw/law/Download.ashx?FileID=40411
權威機構
IARC – INTERNATIONAL AGENCY FOR RESEARCH ON CANCER
這文件是最關鍵的文件
[PDF] ortho-TOLUIDINE - IARC Monographs
There is sufficient evidence in humans for the carcinogenicity of ortho-toluidine. ortho-To l u i-dine causes cancer of the urinary bladder.There is sufficient evidence in experi-mental animals for the carcinogenicity of ortho-toluidine. There is moderate mechanistic evidence indicating that the carcinogenicity of ortho-tolu-idine involves metabolic activation, formation of DNA adducts, and induction of DNA-damaging effects.ortho-Toluidine is carcinogenic to humans (G ro u p 1).
