Phenol Red Indicator Solution in a 100 mL marked dropper bottle provides an easy-to-use colorimetric method for determining pH. It changes from yellow to red as the sample becomes more alkaline, providing a simple and reliable way to measure pH using a colorimeter.

This phenol red indicator solution is used in Method 10076, which is designed to determine the pH of neutral and slightly alkaline waters in the range of 6.5 to 8.5 units. Chlorine does not interfere at levels of 6 mg/L Cl2 or less, but salt water (seawater) interferes and cannot be analyzed with this method. A colorless pH 7 buffer (PN 1222249) is used as a control standard in this method, with results expected to be within +/-0.1 pH unit.
此酚紅指示劑溶液用於測試方法 10076 - 測定 pH 值在 6.5 至 8.5 範圍內的中性和弱鹼性水體的 pH 值。氯濃度低於 6 mg/L 時不會產生干擾，但鹽水（海水）會產生干擾，因此無法使用此方法進行分析。本方法使用無色 pH 7 緩衝液（PN 1222249）作為控制標準，預期結果的誤差在 +/-0.1 pH 單位以內。

100 mL 註有刻度滴管瓶中的酚紅指示劑溶液提供簡單容易使用的比色法測定 水中pH 值。隨著樣品鹼度增強，溶液顏色由黃色變為紅色，進而提供一個使用比色計測量 pH 值的簡單可靠的方法。

Chlorine greater than 6 mg/L may interfere with this phenol red pH test. To remove chlorine from the sample, add one drop of 0.1 N sodium thiosulfate solution (PN 2700832) per 5 mL sample, mix, and then add the pH indicator. This procedure will remove up to 50 mg/L of chlorine from the sample. A DR900 or DR300 colorimeter is required for this method.
氯濃度高於 6 mg/L 時可能會干擾此酚紅 pH 值測試。要去除樣本中的氯，每 5 mL 樣本加入 1 滴 0.1 N 硫代硫酸鈉溶液（PN 2700832），混勻，然後加入 pH 指示劑。此步驟可去除樣品中高達 50 mg/L 的氯。此方法需要使用 DR900 或 DR300 比色計。

Phenol Red (PN 2657512) is a component of these items: 251242, 2688800, and 2691100. Method 10076 requires a colorimeter such as the DR900 or DR300.
酚紅（PN# 2657512）是以下產品的成分：#251242、#2688800 和 #2691100。分析方法 10076 需使用 DR900 或 DR300 比色計。

關鍵字 : 水中 酸鹼度 指試劑 溶液