Food additive databasepH adjuster, leavening agent, kansui, seasoningChecked 2026-10-02
Potassium Dihydrogen Phosphate (Potassium Phosphate, Monobasic) リン酸二水素カリウム（別名リン酸一カリウム）
Designated additivePermitted in the EU (E340)EFSA ADI 40mg per kg body weight per day
- Purpose
- pH adjuster, leavening agent, kansui, seasoning
- On the label
- “リン酸塩（K）” (phosphates (K)), “pH調整剤” (pH adjuster), “膨脹剤” (leavening agent), “かんすい” (kansui), “調味料（無機塩）” (seasoning (inorganic salts)), “リン酸K” (potassium phosphate)
- Name in the List of Designated Additives
- リン酸二水素カリウム（別名リン酸一カリウム） (No. 469)
In Japan
- One of the potassium salts of phosphoric acid. There are no standards for use (rules on permitted foods and amounts).
- When used as kansui, a pH adjuster, a leavening agent, or a seasoning (inorganic salts), or as an emulsifier in processed cheese products, it can be labeled with the group name. The simplified names when written by substance name are “リン酸K” and “リン酸カリウム”. When used together with other phosphates, they can be grouped together, for example as “リン酸塩（Na、K）” (phosphates (Na, K)) (the CAA's “食品表示基準について” (Notes on the Food Labeling Standards), Attachment).
Japan's standards for use
There are no standards for use that limit which foods or how much (the general standards for all additives still apply).
This is a summary of the standards for use. See the source list for the exact conditions.
In the EU
- It is on the EU list of food additives (Regulation (EC) No 1333/2008, Annex II) as E340.
- In its 2019 evaluation, EFSA (the European Food Safety Authority) set an ADI (acceptable daily intake) of 40mg per kg of body weight per day (a group ADI, for the total of related substances) (EFSA FAF).
When it is labeled under a shared name
Potassium Dihydrogen Phosphate (Potassium Phosphate, Monobasic) may be declared on the label in the same way as “リン酸塩”. See Phosphates for details.
Sources
- List of Designated Additives — Japan Food Chemical Research Foundation (Japanese)
- Standards for use and storage of each additive — Japan Food Chemical Research Foundation (Japanese)
- EU food additive database (Japanese translation) — MAFF (Japanese)
- Regulation (EC) No 1333/2008 on food additives — EUR-Lex
- EFSA OpenFoodTox (chemical hazards database)
- 消費者庁「食品表示基準について」別添 添加物1-1〜1-5（簡略名・用途名併記・一括名・栄養強化の範囲）東京都保健医療局の掲載版 (Japanese)
Checked 2026-10-02. Rules and evaluations change over time. This page is a translation of our Japanese page; if they differ, the Japanese page is the reference.
This page lists facts stated in laws and in evaluations by public bodies; it is not a safety verdict. Additives used in Japan are approved by the government, which sets the foods and amounts they can be used in. The ADI is a guide to the amount that is considered safe to take every day over a lifetime.