乙、感官準則 Part B. Aesthetic Guidelines 監測結果(註釋1) Monitoring Data(Note 1) (04/2021 - 03/2022) 準則值 Guideline Value 達標(註釋 2) Compliance(Note 2) 參數 Parameter 單位 Unit 最低值 Minimum 最高值 Maximum 平均值 Average 鋁 Aluminium 毫克/公升 mg/L < 0.01 0.20 0.03 ≤ 0.2 ✓ 色度 Colour Hazen < 5 < 5 < 5 ≤ 15 ✓ 鐵 Iron 毫克/公升 mg/L < 0.01 0.18 < 0.01 ≤ 0.3 ✓ 錳 Manganese 毫克/公升 mg/L < 0.01 0.03 < 0.01 ≤ 0.08 註釋3 Note 3 ✓ 2-甲基異茨醇 2-Methyl-isoborneol (MIB) 納克/公升 ng/L < 5 38 8.2 ≤ 50 ✓ 氣味 Odour -- 無異味 Unobjectionable 無異味 Unobjectionable ✓ 酸鹼值 (水溫25℃時) pH at 25 ℃ -- 6.6 9.1 8.3 6.5 - 9.5 ✓ 味道 Taste -- 無異味 Unobjectionable 無異味 Unobjectionable ✓ 混濁度 Turbidity NTU < 0.1 6.8 0.2 ≤ 3 ✓ 鋅 Zinc 毫克/公升 mg/L < 0.01 0.15 < 0.01 ≤ 1.5 ✓ 註釋 1. 以上參數是有關香港食水的感官質量。水質超過感官準則值一般不會導致健康問 題，但可能會導致較差的感官質量。 2. " ✓" 表示這時段內抽取的食水樣本的食水水質均完全符合感官準則。 3. 錳的準則值於2022 年 3 月 10 日起由 <0.1 毫克/公升更新為 <0.08 毫克/公升。 4. 於2021 年5 月4 日、5 月11 日和10 月25 日，在恆常水質監測期間的三個食水樣 本錄得混濁度分別為6.8 NTU、3.5 NTU及3.3 NTU。水務署已即時採取了適當的 跟進行動。分別在2021 年5 月5 日、5 月12 日和10 月25 日所抽取的食水樣本 確認相關供水系統的混濁度已恢復正常並符合感官準則。本報告涵蓋期內，混濁 度的達標率為99.991%。 Notes 1. The above parameters relate to the aesthetic quality of drinking water in Hong Kong. The exceedance of which could cause objectionable aesthetic effects but will not cause health concerns in general. 2. " ✓" indicates full compliance of drinking water quality with the AG in all water samples taken during this period. 3. The guideline value of manganese was updated from <0.1 mg/L to <0.08 mg/L on 10 March 2022. 4. Turbidities of 6.8 NTU, 3.5 NTU and 3.3 NTU were found in three drinking water samples collected on 4 May, 11 May and 25 October 2021 respectively, during the routine monitoring of the drinking water quality. Appropriate follow-up actions were taken immediately. Water samples collected on 5 May, 12 May and 25 October 2021 respectively, confirmed that turbidity levels of the relevant water supply systems resumed normal and were in compliance with the AG. The compliance rate of turbidity during this reporting period is 99.991%. 數據一覽 Data Summary 水務署 二零二一至二二年年報 WSD Annual Report 2021/22 123
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