Davoaldo
01/04/2008, 08:19 AM
I just got a calcium test kit from API and i am not too sure on how to use it. Can anyone help me?
I don't get what point 5 and point 6 of the instruction is saying?
Does the whole tube of liquid have to be blue to be the end point or when the drop hits the solution it turns blue?
What if it slowly turns blue?
My solution never seems to turn blue whenever I shake it will will turn to pink.
What am i doing wrong?
5. Holding the bottle vertically, add Calcium Test Solution #2, drop by drop to the test tube until the solution changes from pink to the blue end-point. Each drop is equivalent to 20 mg/L (ppm) calcium (Ca2+). Cap and shake the test tube between drops. Be sure to count the drops added.
a. A pink color should form after the first drop.
b. If a blue color forms after the first drop, the calcium concentration is 20 mg/L (ppm) or below.
6. As the end-point is approached, the color will usually change from pink to purple before finally changing to blue. After the purple color forms, only one or two more drops should be required to reach the blue endpoint.
I don't get what point 5 and point 6 of the instruction is saying?
Does the whole tube of liquid have to be blue to be the end point or when the drop hits the solution it turns blue?
What if it slowly turns blue?
My solution never seems to turn blue whenever I shake it will will turn to pink.
What am i doing wrong?
5. Holding the bottle vertically, add Calcium Test Solution #2, drop by drop to the test tube until the solution changes from pink to the blue end-point. Each drop is equivalent to 20 mg/L (ppm) calcium (Ca2+). Cap and shake the test tube between drops. Be sure to count the drops added.
a. A pink color should form after the first drop.
b. If a blue color forms after the first drop, the calcium concentration is 20 mg/L (ppm) or below.
6. As the end-point is approached, the color will usually change from pink to purple before finally changing to blue. After the purple color forms, only one or two more drops should be required to reach the blue endpoint.