Determining the transparency of seawater by the Seidler disc method (CAT#: STEM-PPA-0067-LJX)

The transparency disc (also known as the Sayman disc) is made of a thick sheet of white iron, a round plate with a diameter of 200mm. One side of the round plate is divided into four sections from the center, painted in black and white. Make a small hole in the center of the disc, thread a lead wire, and add a plumb hammer under it. Tie a small string to the lead wire and make a mark with colored thread or paint every 10cm on the string.
Place the disc in the backlight of the ship into the water, and gradually sink until the white surface of the disc can not be seen, and record its scale, that is, the transparency number, in cm. The observation should be repeated two to three times.

For detecting the transparency of liquids

1. Make a Serge plate
2. Put the disc into the water in the backlight of the ship, and gradually sink until the white color of the disc cannot be seen, and record the scale
3. Repeat Step 2 two to three times

• Sample Type:
Seawater

After the transparency plate is used for a long time, the color of the white paint will gradually turn yellow and must be repainted.