Retain raw eBC; document stabilization; quantify negative fractions; review flow, ATN, errors, temperature and RH; report mean, median, P95 and valid duration.
SP2 analysis requires cold chain, clean tools, Aquadag standards, blanks, duplicates, detection limits, depth and full metadata.
---
title: "Black-carbon method"
pagetitle: "Black-carbon method — MeteoAndes"
description: "AL30/AE33 QA/QC, SP2, stratigraphic sampling and soluble ions."
image: ../../assets/img/og/investigacion.jpg
lang: en
header-includes: |
<link rel="alternate" hreflang="es" href="https://meteoandes.com/metodos/carbono-negro.html">
<link rel="alternate" hreflang="en" href="https://meteoandes.com/en/methods/black-carbon.html">
<link rel="alternate" hreflang="x-default" href="https://meteoandes.com/metodos/carbono-negro.html">
format:
html:
code-tools: true
code-fold: true
---
## Optical instruments
Retain raw eBC; document stabilization; quantify negative fractions; review flow, ATN, errors, temperature and RH; report mean, median, P95 and valid duration.
```python
qc = raw.assign(valid_flow=raw.flow.between(45, 55))
```
SP2 analysis requires cold chain, clean tools, Aquadag standards, blanks, duplicates, detection limits, depth and full metadata.