Food additive databasepH adjuster, kansui, seasoning, leavening agentChecked 2026-10-02
Sodium Dihydrogen Phosphate (Sodium Phosphate, Monobasic) リン酸二水素ナトリウム（別名リン酸一ナトリウム）
Designated additivePermitted in the EU (E339(i))EFSA ADI 40mg per kg body weight per day
- Purpose
- pH adjuster, kansui, seasoning, leavening agent
- On the label
- “pH調整剤” (pH adjuster), “かんすい” (kansui), “調味料（無機塩）” (seasoning (inorganic salts)), “膨張剤” (leavening agent), “リン酸ナトリウム” (sodium phosphate), “リン酸Na” (sodium phosphate), “リン酸塩（Na）” (phosphates (Na))
- Name in the List of Designated Additives
- リン酸二水素ナトリウム（別名リン酸一ナトリウム） (No. 473)
In Japan
- One of the sodium salts of phosphoric acid (another name is monosodium phosphate, “リン酸一ナトリウム”). No standards for use have been set.
- It falls within the scope of the group names pH adjuster, kansui, seasoning (inorganic salts), and leavening agent, and in processed cheese it is also treated as an emulsifier. When written by substance name, the short names are “リン酸ナトリウム” (sodium phosphate) and “リン酸Na” (sodium phosphate).
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 E339(i).
- 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
Sodium Dihydrogen Phosphate (Sodium 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 添加物関係（簡略名・用途名併記・一括名・栄養強化の範囲） (Japanese)
- EFSA FAF Panel (2019) Re-evaluation of phosphoric acid–phosphates – di-, tri- and polyphosphates (E 338–341, E 343, E 450–452) as food additives (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.