HGW: Arsenic, Average total content (surface)

The mean is the median (synonym: 50. percentile, central value). It is the value above or below which 50% of all cases of a data group are located. The calculation is carried out on outlier-adjusted data collectives. The total content is determined from the aqua regia extract (according to DIN ISO 11466 (1997)). The concentration is given in mg/kg. The BBodSchV (1999) does not set precautionary values for arsenic. According to LABO (2003) a sample count of >=20 is required for the calculation of background values. However, the map also shows groups with a sample count >= 10. This information is then only informal and not representative. Further information on definitions, horizon grouping and statistical evaluation: (https://mapserver.lgb-rlp.de/php_hgw_bod/meta/background values_hints.pdf)