In Japan, the Water Supply Act is a law enacted in 1957 with the aim of properly developing and managing waterworks to ensure the stable supply of clean, abundant, and affordable tap water. The water quality standards were initially set with 50 items under the Ministry of Health, Labour and Welfare Ordinance No. 101 (May 30, 2003), 'Ordinance on Water Quality Standards.' on April 1, 2014, nitrite nitrogen was added, bringing the total to 51 items. Additionally, the testing methods are stipulated by the Ministry of Health, Labour and Welfare Notification No. 261 (July 22, 2003), 'Methods Determined by the Minister of the Environment Based on the Provisions of the Ordinance on Water Quality Standards,' and have been revised subsequently.
Below is the list of Shodex anion columns suitable for the analysis of anions mentioned in the ordinance.
| Analysis method | Analyte | Reference value | Shodex column |
|---|---|---|---|
| (Appended Table No.12) Ion chromatography-post column adsorption photometry |
Cyanide ion and Cyanogens chloride | ≤ 0.01 mg/L (amount of cyan) |
RSpak KC-811 6E |
| (Appended Table No.13) Ion chromatography (anion) Simultaneous analysis method |
Nitrite nitrogen | ≤ 0.04 mg/L | IC SI-52 4E IC SI-35 4D |
| Nitrate nitrogen and Nitrite nitrogen | ≤ 10 mg/L | ||
| Fluoride and its compounds | ≤ 0.8 mg/L (amount of fluoride) |
||
| Chlorate | ≤ 0.6 mg/L | ||
| Chloride ion | ≤ 200 mg/L | ||
| (Appended Table No.18) Ion chromatography-post column adsorption photometry |
Bromate | ≤ 0.01 mg/L | IC SI-50 4E IC SI-52 4E |
| (Appended Table No.18-2) LC-MS method |
Chlorate and Bromate | Chlorate: ≤ 0.6 mg/L Bromate: ≤ 0.01 mg/L |
RSpak JJ-50 2D |
Operation Manual / Certificate of Analysis
Operation Manuals and Certificate of Analysis / Inspection Certificate for the following products can be downloaded here.