What is in 10% NBF?

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Multiple Choice

What is in 10% NBF?

Explanation:
Neutral buffered formalin is a formaldehyde solution kept at a neutral pH by a phosphate buffer. The buffering system uses sodium phosphate dibasic and sodium phosphate monobasic to maintain a pH around 7, which helps prevent fixation artifacts. Therefore, 10% NBF contains both formaldehyde and these phosphate buffering salts. It does not rely on acetic acid, and it is not just formaldehyde alone or just the salts without the fixative. That combination—formaldehyde plus the phosphate buffers—best describes 10% NBF.

Neutral buffered formalin is a formaldehyde solution kept at a neutral pH by a phosphate buffer. The buffering system uses sodium phosphate dibasic and sodium phosphate monobasic to maintain a pH around 7, which helps prevent fixation artifacts. Therefore, 10% NBF contains both formaldehyde and these phosphate buffering salts. It does not rely on acetic acid, and it is not just formaldehyde alone or just the salts without the fixative. That combination—formaldehyde plus the phosphate buffers—best describes 10% NBF.

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