Phosphorus value measured with Hanna ULR (ppb). Which ICP value does this correspond to?

javichuteck

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Good morning.

I have a question.

I have the Hanna phosphorus ULR (ppb) HI736 test.
I have recently done an ICP (Tropic Marin)

And I have doubts about what ICP value I should check my measured values against the Hanna Phosphorus test.

My last measurement with the Hanna Phosphorus test was 67ppb.
This value, converted using the Hanna conversion tables (here) or the direct formula (ppb * 3.06) / 1000 gives me the value 0.205 ppm.

I believe that when using the Hanna conversion table (or the direct formula mentioned above) you are going from ppb phosphorus to ppm phosphate, right?

My ICP has given me the following values for the phosphorus and phosphate concept:
- Phosphorus: 0.064 mg/l (327% of ideal value)
- Total phosphate: 0.19622 mg/l (280% of ideal value)
- Orthophosphate: 0.168 mg/l (161.3% of ideal value)
My question is: this converted value (0.205ppm) against which previous value should I compare it?

Thank you!
 
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javichuteck

javichuteck

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Phosphorous can be compared directly to phosphorus. 1 ppb ~ 1 ug/L = 0.001 mg/L

67 ppb = 0.067 ppm
I don't agree with that calculation when compared to Hanna's table.

According to the hanna table 67ppb is 0.205 ppm.

So if I look at my ICP, and the data referring to phosphorus:
- Phosphorus: 0.064 mg/l (327% of ideal value)
- Total phosphate: 0.19622 mg/l (280% of ideal value)
- Orthophosphate: 0.168 mg/l (161.3% of ideal value)
Does not appear to match any (but is a little close to total phosphate).
 
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javichuteck

javichuteck

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Okay, understood.

It was a mistake on my part when I read it, apologies.

So:
- 67 ppb phosphorus = 0.067 ppm phosphorus = 0.067 mg/L phosphorus.
- 67 ppb of phosphorus = 0.205 ppm of phosphate

That's right, isn't it?

I got confused with the conversions and elements.
Thanks
 

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